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x in (-oo:+oo)
X/7 = x/8-12 // - x/8-12
X/7-(x/8)+12 = 0
1/7*X-1/8*x+12 = 0 // - 1/7*X+12
-1/8*x = -(1/7*X+12) // : -1/8
x = (-(1/7*X+12))/(-1/8)
x = 8*(1/7*X+12)
x = 8*(1/7*X+12)
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