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X in (-oo:+oo)
31.5 = (3/4)*X // - (3/4)*X
31.5-((3/4)*X) = 0
(-3/4)*X+31.5 = 0
31.5-3/4*X = 0 // - 31.5
-3/4*X = -31.5 // : -3/4
X = -31.5/(-3/4)
X = 42
X = 42
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