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(-6*x^1)/9 = -18 // + 18
(-6*x^1)/9+18 = 0
(-6*x)/9+18 = 0
18-2/3*x = 0 // - 18
-2/3*x = -18 // : -2/3
x = -18/(-2/3)
x = 27
x = 27
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