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x in (-oo:+oo)
-18 = (1/4)*x-15 // - (1/4)*x-15
15-((1/4)*x)-18 = 0
(-1/4)*x-18+15 = 0
-1/4*x-3 = 0 // + 3
-1/4*x = 3 // : -1/4
x = 3/(-1/4)
x = -12
x = -12
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