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3-((2/9)*x) = (1/3)*x-7 // - (1/3)*x-7
3-((2/9)*x)-((1/3)*x)+7 = 0
(-2/9)*x+(-1/3)*x+3+7 = 0
10-5/9*x = 0 // - 10
-5/9*x = -10 // : -5/9
x = -10/(-5/9)
x = 18
x = 18
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