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x in (-oo:+oo)
X/2+18 = x/5-12 // - x/5-12
X/2-(x/5)+12+18 = 0
1/2*X-1/5*x+30 = 0 // - 1/2*X+30
-1/5*x = -(1/2*X+30) // : -1/5
x = (-(1/2*X+30))/(-1/5)
x = 5*(1/2*X+30)
x = 5*(1/2*X+30)
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