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x in (-oo:+oo)
(2*(x-7))/9 = x/3 // - x/3
(2*(x-7))/9-(x/3) = 0
(2*(x-7))/9-x/3 = 0
(2*3*(x-7))/(3*9)+(9*(-x))/(3*9) = 0
2*3*(x-7)+9*(-x) = 0
-3*x-42 = 0
(-3*x-42)/(3*9) = 0
(-3*x-42)/(3*9) = 0 // * 3*9
-3*x-42 = 0
-3*x-42 = 0 // + 42
-3*x = 42 // : -3
x = 42/(-3)
x = -14
x = -14
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