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x in (-oo:+oo)
-25 = (5/3)*x // - (5/3)*x
-((5/3)*x)-25 = 0
(-5/3)*x-25 = 0
-5/3*x-25 = 0 // + 25
-5/3*x = 25 // : -5/3
x = 25/(-5/3)
x = -15
x = -15
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