1)17-5(2х+7)=4(5х-3) 2)3х-5(6х-7)=5-6(2х-5) 3)-3(х+12)-2(х-18)=-5х 4)8х+12=5х+3 5)3(2х+1)+7=4 6)6+3(5х-7)=4х+7 7)3(7х-4)-4(6х+5)=х 8)3х-5(2х=3)-6(5х-4)=-28 9)3(х+21)+2(х-4)=5(х+11) 10)-3х-25=-6-7 11)6(3х-1)-6=4 12)9х+2=4(5х-3)-8 13)4-2(6х-5)=6(4х+3) 14)6(3х-4)-7(2х+5)=2х-1 15)2.3(х-0.3)+0.5х=2.8

1)17-5(2х+7)=4(5х-3)17-10x-35=20x-1220x+10x=17-35+1230x=-6x=-6: 30x=-0,2  2)3х-5(6х-7)=5-6(2х-5)3x-30x+35=5-12x+30-12x-3x+30x=35-5-3015x=0x=03)-3(х+12)-2(х-18)=-5х-3x-36-2x+36=-5x-3x-2x+5x=36-360=0 (x любое значение)4)8х+12=5х+38x-5x=3-123x=-9x=-9: 3x=-35)3(2х+1)+7=46x+3+7=46x+10=46x=4-106x=-6x=-16)6+3(5х-7)=4х+76+15x-21=4x+715x-4x=7-6+2111x=22x=22: 11x=27)3(7х-4)-4(6х+5)=х21x-12-24x-20=x21x-24x-x=12+20-4x=32x=32: (-4)x=-88)3х-5(2х+3)-6(5х-4)=-283x-10x-15-30x+24=-283x-10x-30x=-28+15-24-37x=37x=-19)3(х+21)+2(х-4)=5(х+11)3x+63+2x-8=5x+553x+2x-5x=55-63+80=0 (x любое значение)10)-3х-25=-6-7-3x=-6-7+25-3x=12x=12: (-3)x=-411)6(3х-1)-6=418x-6-6=418x=4+6+618x=16x=16: 18x=8/912)9х+2=4(5х-3)-89x+2=20x-12-89x-20x=-12-8-2-11x=-22x=22: 11x=213)4-2(6х-5)=6(4х+3)4-12x+10=24x+18-12x-24x=18-4-10-36x=4x=4: (-36)x=-1/914)6(3х-4)-7(2х+5)=2х-118x-24-14x-35=2x-118x-14x-2x=-1+24+352x=58x=58: 2x=2915)2.3(х-0.3)+0.5х=2.82,3x-0,69+0,5x=2,82,3x+0,5x=2,8+0,692,8x=3,49x=3,49: 2,8x=1 69/280

например расстояние=скорость*время