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x in (-oo:+oo)
40 = (-4/7)*x // - (-4/7)*x
40-((-4/7)*x) = 0
(4/7)*x+40 = 0
4/7*x+40 = 0 // - 40
4/7*x = -40 // : 4/7
x = -40/4/7
x = -70
x = -70
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