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