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x in (-oo:+oo)
2*(x+6) = 11*(x-(8/7)) // - 11*(x-(8/7))
2*(x+6)-(11*(x-(8/7))) = 0
2*(x+6)-11*(x-8/7) = 0
2*(x+6)-11*(x-8/7) = 0
172/7-9*x = 0
172/7-9*x = 0
172/7-9*x = 0 // - 172/7
-9*x = -172/7 // : -9
x = -172/7/(-9)
x = 172/63
x = 172/63
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