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