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