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x in (-oo:+oo)
3*x-(15/2) = 4*x // - 4*x
3*x-(4*x)-(15/2) = 0
3*x-4*x-15/2 = 0
-x-15/2 = 0 // + 15/2
-x = 15/2 // * -1
x = -15/2
x = -15/2
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