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x in (-oo:+oo)
(-6/7)*x+x+2 = 22/7 // - 22/7
(-6/7)*x+x-(22/7)+2 = 0
(-6/7)*x+x-22/7+2 = 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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