x÷2+12 = x-13解:x/2+12 = x-13 x/2-x = -13-12 x/2×2-2x = -26-24 -x = -50 x = 50
x/2+12=x-13 解 -x/2=-25 x=50望楼主采纳
x/2-x=-12-13-x/2=-25x==50
x/2+12=x-13 -x/2=-25 x=50