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