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x in (-oo:+oo)
15 = (-5/3)*x // - (-5/3)*x
15-((-5/3)*x) = 0
(5/3)*x+15 = 0
5/3*x+15 = 0 // - 15
5/3*x = -15 // : 5/3
x = -15/5/3
x = -9
x = -9
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