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x in (-oo:+oo)
15 = (3/4)*x // - (3/4)*x
15-((3/4)*x) = 0
(-3/4)*x+15 = 0
15-3/4*x = 0 // - 15
-3/4*x = -15 // : -3/4
x = -15/(-3/4)
x = 20
x = 20
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