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x-(9*x)+10+11 = 3*(1/2-2*x)+12*x // - 3*(1/2-2*x)+12*x
x-(3*(1/2-2*x))-(9*x)-(12*x)+10+11 = 0
x-3*(1/2-2*x)-9*x-12*x+10+11 = 0
x-3*(1/2-2*x)-9*x-12*x+10+11 = 0
7*x-9*x-12*x-3/2+10+11 = 0
10-2*x-12*x-3/2+11 = 0
10-14*x-3/2+11 = 0
17/2-14*x+11 = 0
39/2-14*x = 0
39/2-14*x = 0
39/2-14*x = 0 // - 39/2
-14*x = -39/2 // : -14
x = -39/2/(-14)
x = 39/28
x = 39/28
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