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x in (-oo:+oo)
12-((3/2)*x) = 3 // - 3
12-((3/2)*x)-3 = 0
(-3/2)*x-3+12 = 0
9-3/2*x = 0 // - 9
-3/2*x = -9 // : -3/2
x = -9/(-3/2)
x = 6
x = 6
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