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x in (-oo:+oo)
(5/7)*x = -6/7 // + -6/7
(5/7)*x-(-6/7) = 0
(5/7)*x+6/7 = 0
5/7*x+6/7 = 0 // - 6/7
5/7*x = -6/7 // : 5/7
x = -6/7/5/7
x = -6/5
x = -6/5
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