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x in (-oo:+oo)
-4 = 5*x-(13/(-8)) // - 5*x-(13/(-8))
13/(-8)-(5*x)-4 = 0
13/(-8)-5*x-4 = 0
-5*x-45/8 = 0 // + 45/8
-5*x = 45/8 // : -5
x = 45/8/(-5)
x = -9/8
x = -9/8
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