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x in (-oo:+oo)
14 = (-7/5)*x // - (-7/5)*x
14-((-7/5)*x) = 0
(7/5)*x+14 = 0
7/5*x+14 = 0 // - 14
7/5*x = -14 // : 7/5
x = -14/7/5
x = -10
x = -10
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