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x in (-oo:+oo)
16 = (-4/5)*x // - (-4/5)*x
16-((-4/5)*x) = 0
(4/5)*x+16 = 0
4/5*x+16 = 0 // - 16
4/5*x = -16 // : 4/5
x = -16/4/5
x = -20
x = -20
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