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x in (-oo:+oo)
(3/7)*x+5 = (-4/7)*x-3 // - (-4/7)*x-3
(3/7)*x-((-4/7)*x)+3+5 = 0
(3/7)*x+(4/7)*x+3+5 = 0
x+8 = 0 // - 8
x = -8
x = -8
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