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x in (-oo:+oo)
-13 = (1/2)*(4*x-8) // - (1/2)*(4*x-8)
-((1/2)*(4*x-8))-13 = 0
(-1/2)*(4*x-8)-13 = 0
-1/2*(4*x-8)-13 = 0
-1/2*(4*x-8)-13 = 0
-2*x-9 = 0
-2*x-9 = 0
-2*x-9 = 0 // + 9
-2*x = 9 // : -2
x = 9/(-2)
x = -9/2
x = -9/2
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