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7-((1/3)*x) = 187/27 // - 187/27
7-((1/3)*x)-(187/27) = 0
(-1/3)*x-187/27+7 = 0
2/27-1/3*x = 0 // - 2/27
-1/3*x = -2/27 // : -1/3
x = -2/27/(-1/3)
x = 2/9
x = 2/9
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