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x in (-oo:+oo)
-2 = (-4/7)*x // - (-4/7)*x
-((-4/7)*x)-2 = 0
(4/7)*x-2 = 0
4/7*x-2 = 0 // + 2
4/7*x = 2 // : 4/7
x = 2/4/7
x = 7/2
x = 7/2
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