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x in (-oo:+oo)
12-((3/2)*x) = (5/2)*x // - (5/2)*x
12-((3/2)*x)-((5/2)*x) = 0
(-3/2)*x+(-5/2)*x+12 = 0
12-4*x = 0 // - 12
-4*x = -12 // : -4
x = -12/(-4)
x = 3
x = 3
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