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x in (-oo:+oo)
8/12 = (-2/7)*x // - (-2/7)*x
8/12-((-2/7)*x) = 0
(2/7)*x+8/12 = 0
2/7*x+2/3 = 0 // - 2/3
2/7*x = -2/3 // : 2/7
x = -2/3/2/7
x = -7/3
x = -7/3
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