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x in (-oo:+oo)
-16 = (-4/7)*x // - (-4/7)*x
-((-4/7)*x)-16 = 0
(4/7)*x-16 = 0
4/7*x-16 = 0 // + 16
4/7*x = 16 // : 4/7
x = 16/4/7
x = 28
x = 28
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