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x in (-oo:+oo)
15 = (-3/2)*x // - (-3/2)*x
15-((-3/2)*x) = 0
(3/2)*x+15 = 0
3/2*x+15 = 0 // - 15
3/2*x = -15 // : 3/2
x = -15/3/2
x = -10
x = -10
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