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5*(1/2)-(12*(1/2))+8 = 2*x-6*x-3 // - 2*x-6*x-3
5*(1/2)-(-6*x)-(2*x)-(12*(1/2))+3+8 = 0
6*x-2*x+5*(1/2)-6+3+8 = 0
4*x+15/2 = 0 // - 15/2
4*x = -15/2 // : 4
x = -15/2/4
x = -15/8
x = -15/8
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