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x in (-oo:+oo)
-18 = (3/4)*x // - (3/4)*x
-((3/4)*x)-18 = 0
(-3/4)*x-18 = 0
-3/4*x-18 = 0 // + 18
-3/4*x = 18 // : -3/4
x = 18/(-3/4)
x = -24
x = -24
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