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x in (-oo:+oo)
(4/7)*x-3 = x // - x
(4/7)*x-x-3 = 0
-3/7*x-3 = 0 // + 3
-3/7*x = 3 // : -3/7
x = 3/(-3/7)
x = -7
x = -7
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