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x in (-oo:+oo)
x+8/7 = (6/7)*x // - (6/7)*x
x-((6/7)*x)+8/7 = 0
x+(-6/7)*x+8/7 = 0
1/7*x+8/7 = 0 // - 8/7
1/7*x = -8/7 // : 1/7
x = -8/7/1/7
x = -8
x = -8
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