4(-1,2x+2,5y)-3(3,2x-0,6y)

6.\;\;11x +103 = 1 +(12x-31)\\\\11x - 12x = 1-31-103\\\\x = 133\\ \\ \\7.\;\;(2x+3) - (5x+11) = 7 + (13-2x)\\ \\2x - 5x + 2x = 7+13 - 3 + 11\\\\x = -28\\\\ \\8.\;\;(2x+3)+(3x+4) + (5x+5) = 12 -7x\\\\2x+3x+5x+7x = 12 - 3 - 4 - 5\\\\17x = 0\\\\x = 0\\\\

9.

6x = 1 - (4-6x)  

6x - 6x = 1-4

0x = -3  - нет решений

10.

6y - (y-4) = 4+5y  

6y - y - 5y = 4 - 4  

0y = 0   y - любое число

11.\;\;5.6 - 7y = -4(2y-0.9) + 2.4\\\\-7y + 8y = 3.6 + 2.4 - 5.6\\\\y = 0.4\\\\ \\12.\;\;x-0.5 = 2(0.3x - 0.2)\\\\x - 0.6x = -0.4 + 0.5\\\\0.4x = 0.1\\\\x = \frac{0.1}{0.4} = \frac{1}{4} = 0.25

13.\;\;3(2.5 - 2x) = 13.5 - 14x\\\\-6x + 14x = 13.5 - 7.5\\\\8x = 6\\\\x = \frac{6}{8} = \frac{3}{4} = 0.75\\\\ \\14.\;\; 0.6y - 1.5 = 0.3(y-4)\\\\0.6y-0.3y = -1.2 + 1.5\\\\0.3y = 0.3\\\\y = 1\\\\ \\15.\;\; 0.5(4-2a) = a - 1.8\\\\-a - a = -1.8 - 2\\\\-2a = -3.8\\\\a = 1.9\\\\

16.\;\; 7(3+x) = 2(x-5) +8\\\\7x - 2x = -10 + 8 -21\\\\5x = -23\\\\x = -\frac{23}{5} = -4\frac{3}{5} = -4.6\\\\

17.\;\;-0.2(5-0.7x) + 0.02 = 1.4(x-1.6)  

0.14x - 1.4x = -2.24 + 1 - 0.02

-1.26x = -1.26  

x= 1  

18. \;\; 1.2(3b+5) = 2(2.4b - 3.6)\\\\3.6b - 4.8b = -7.2 - 6\\\\-1.2b = -13.2\\\\b = \frac{13.2}{1.2} = \frac{132}{12} = 11\\\\ \\19. \;\;3.2(5x-1) = 3.6x - 9.4\\\\16x - 3.6x = -9.4+3.2\\\\12.4x = -6.2\\\\x = -0.5\\\\ \\20.\;\;8(0.7x -4) - 2(0.2x - 3) = -39\\\\5.6x -0.4x = -39+32-6\\\\5.2x = -13\\\\x = -\frac{13}{5.2} = -\frac{130}{52} = -\frac{5}{2} = -2.5\\\\ \\21.\;\;-3(2.1z - 4) - 4.2 = 1.2(-5z + 0.5)\\\\-6.3z+6z = 0.6 - 12 + 4.2\\\\-0.3z = -7.2\\\\z = 24\\\\

22.\;\; 6.4(2-3y) = 6(0.8y-1) +6.8\\\\-19.2y -4.8y = -6+6.8-12.8\\\\-24y = -12\\\\y = 0.5

На

Пошаговое объяснение:

a)70017418

б) 29086050

в)29086050