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x in (-oo:+oo)
(6/7)*x-6 = -8 // + 8
(6/7)*x-6+8 = 0
6/7*x+2 = 0 // - 2
6/7*x = -2 // : 6/7
x = -2/6/7
x = -7/3
x = -7/3
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