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7-((1/3)*x) = 3-((2/9)*x) // - 3-((2/9)*x)
(2/9)*x-((1/3)*x)-3+7 = 0
(-1/3)*x+(2/9)*x-3+7 = 0
4-1/9*x = 0 // - 4
-1/9*x = -4 // : -1/9
x = -4/(-1/9)
x = 36
x = 36
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