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x in (-oo:+oo)
(6/7)*x+1 = -11/7 // + -11/7
(6/7)*x-(-11/7)+1 = 0
(6/7)*x+11/7+1 = 0
6/7*x+18/7 = 0 // - 18/7
6/7*x = -18/7 // : 6/7
x = -18/7/6/7
x = -3
x = -3
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