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x in (-oo:+oo)
15 = (4/5)*x // - (4/5)*x
15-((4/5)*x) = 0
(-4/5)*x+15 = 0
15-4/5*x = 0 // - 15
-4/5*x = -15 // : -4/5
x = -15/(-4/5)
x = 75/4
x = 75/4
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