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x in (-oo:+oo)
35 = (-7/5)*x // - (-7/5)*x
35-((-7/5)*x) = 0
(7/5)*x+35 = 0
7/5*x+35 = 0 // - 35
7/5*x = -35 // : 7/5
x = -35/7/5
x = -25
x = -25
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