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x in (-oo:+oo)
-6 = (-3/2)*x // - (-3/2)*x
-((-3/2)*x)-6 = 0
(3/2)*x-6 = 0
3/2*x-6 = 0 // + 6
3/2*x = 6 // : 3/2
x = 6/3/2
x = 4
x = 4
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