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x in (-oo:+oo)
18 = (1/4)*x // - (1/4)*x
18-((1/4)*x) = 0
(-1/4)*x+18 = 0
18-1/4*x = 0 // - 18
-1/4*x = -18 // : -1/4
x = -18/(-1/4)
x = 72
x = 72
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