1.2x-10.3x=15 2 .0.52x-(1-0.52)x=80 3 .x/2+3x/2=7 4 .3x+7=32-2x 5 .3x+5(138-x)=540 6 .3x-7(x-1)=3-2(x+3) 7 .18x+3x-3=18-2(2x-1) 8 .3(20-y)=6y-4(y-11) 9 .-(x/4-1)=5 10.3[4(5y-1)-8]=6 11.5x-10=812.12(x-...