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7-(5*x) = (2/3)*x+18/5 // - (2/3)*x+18/5
7-(5*x)-((2/3)*x)-(18/5) = 0
(-2/3)*x-5*x-18/5+7 = 0
17/5-17/3*x = 0 // - 17/5
-17/3*x = -17/5 // : -17/3
x = -17/5/(-17/3)
x = 3/5
x = 3/5
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