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x in (-oo:+oo)
X/8 = x/9-12 // - x/9-12
X/8-(x/9)+12 = 0
1/8*X-1/9*x+12 = 0 // - 1/8*X+12
-1/9*x = -(1/8*X+12) // : -1/9
x = (-(1/8*X+12))/(-1/9)
x = 9*(1/8*X+12)
x = 9*(1/8*X+12)
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