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x in (-oo:+oo)
X/4 = x/5-4 // - x/5-4
X/4-(x/5)+4 = 0
1/4*X-1/5*x+4 = 0 // - 1/4*X+4
-1/5*x = -(1/4*X+4) // : -1/5
x = (-(1/4*X+4))/(-1/5)
x = 5*(1/4*X+4)
x = 5*(1/4*X+4)
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