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x in (-oo:+oo)
x-13 = (1/2)*(4*x-2) // - (1/2)*(4*x-2)
x-((1/2)*(4*x-2))-13 = 0
(-1/2)*(4*x-2)+x-13 = 0
x-1/2*(4*x-2)-13 = 0
x-1/2*(4*x-2)-13 = 0
1-x-13 = 0
-x-12 = 0
-x-12 = 0
-x-12 = 0 // + 12
-x = 12 // * -1
x = -12
x = -12
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