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