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x in (-oo:+oo)
35 = (-5/4)*x // - (-5/4)*x
35-((-5/4)*x) = 0
(5/4)*x+35 = 0
5/4*x+35 = 0 // - 35
5/4*x = -35 // : 5/4
x = -35/5/4
x = -28
x = -28
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