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x in (-oo:+oo)
(-1/7)*x+x+1 = -29/7 // + -29/7
(-1/7)*x+x-(-29/7)+1 = 0
(-1/7)*x+x+29/7+1 = 0
6/7*x+36/7 = 0 // - 36/7
6/7*x = -36/7 // : 6/7
x = -36/7/6/7
x = -6
x = -6
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