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x in (-oo:+oo)
(4/7)*x+6/7 = -(6/7) // + 6/7
(4/7)*x+6/7+6/7 = 0
4/7*x+12/7 = 0 // - 12/7
4/7*x = -12/7 // : 4/7
x = -12/7/4/7
x = -3
x = -3
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