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x in (-oo:+oo)
35 = (-5/2)*x // - (-5/2)*x
35-((-5/2)*x) = 0
(5/2)*x+35 = 0
5/2*x+35 = 0 // - 35
5/2*x = -35 // : 5/2
x = -35/5/2
x = -14
x = -14
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