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x in (-oo:+oo)
(-3/2)*x = 15/8 // - 15/8
(-3/2)*x-(15/8) = 0
(-3/2)*x-15/8 = 0
-3/2*x-15/8 = 0 // + 15/8
-3/2*x = 15/8 // : -3/2
x = 15/8/(-3/2)
x = -5/4
x = -5/4
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