1)6х-7х=77-11 -х=66 х=-66 2)-30-8x=-16x+90 -8х+16х=90+30 8х=120 х=152.5 3)8x+17= -3x+105 8x+3x=105-17 11x=71 x=6 5/11 4)-2(y+3)=-21+3y -2y-6=-21+3y -2y-3y=-21+6 -5y= -15 y=3 5)1(2-m)+3(m-3)=-13 2-m+3m-9=-13 5m=-13+9-2 5m= -6 m=1.2 6)-1(1-3b)-4=4 -1+3b-4=4 3b=4+1+4 3b= 9 b=3 7)-2(7-3y)=16-16(2-y) -14+6y=16-32+16y 6y-16y=16-32+14 -10y= -2 y=0.2