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x in (-oo:+oo)
(6/7)*x = -4/5 // + -4/5
(6/7)*x-(-4/5) = 0
(6/7)*x+4/5 = 0
6/7*x+4/5 = 0 // - 4/5
6/7*x = -4/5 // : 6/7
x = -4/5/6/7
x = -14/15
x = -14/15
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