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x in (-oo:+oo)
(1/9)*(x-18)+(1/6)*(x+6) = x+7 // - x+7
(1/9)*(x-18)+(1/6)*(x+6)-x-7 = 0
1/9*(x-18)+1/6*(x+6)-x-7 = 0
1/9*(x-18)+1/6*(x+6)-x-7 = 0
5/18*x-x-7-1 = 0
-13/18*x-7-1 = 0
-13/18*x-8 = 0
-13/18*x-8 = 0
-13/18*x-8 = 0 // + 8
-13/18*x = 8 // : -13/18
x = 8/(-13/18)
x = -144/13
x = -144/13
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