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