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7-((1/3)*x) = 13/3 // - 13/3
7-((1/3)*x)-(13/3) = 0
(-1/3)*x-13/3+7 = 0
8/3-1/3*x = 0 // - 8/3
-1/3*x = -8/3 // : -1/3
x = -8/3/(-1/3)
x = 8
x = 8
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