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x in (-oo:+oo)
x+2 = (1/7)*x+12/7 // - (1/7)*x+12/7
x-((1/7)*x)-(12/7)+2 = 0
x+(-1/7)*x-12/7+2 = 0
6/7*x+2/7 = 0 // - 2/7
6/7*x = -2/7 // : 6/7
x = -2/7/6/7
x = -1/3
x = -1/3
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