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x in (-oo:+oo)
(2/7)*x+8 = (-5/7)*x-3 // - (-5/7)*x-3
(2/7)*x-((-5/7)*x)+3+8 = 0
(2/7)*x+(5/7)*x+3+8 = 0
x+11 = 0 // - 11
x = -11
x = -11
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