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x in (-oo:+oo)
(-5/8)*x-7.5 = 7.5 // - 7.5
(-5/8)*x-7.5-7.5 = 0
-5/8*x-15 = 0 // + 15
-5/8*x = 15 // : -5/8
x = 15/(-5/8)
x = -24
x = -24
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