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x in (-oo:+oo)
(6/7)*x = -12/7 // + -12/7
(6/7)*x-(-12/7) = 0
(6/7)*x+12/7 = 0
6/7*x+12/7 = 0 // - 12/7
6/7*x = -12/7 // : 6/7
x = -12/7/6/7
x = -2
x = -2
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