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1/7-(3*x) = 6*x-(566/7) // - 6*x-(566/7)
1/7-(3*x)-(6*x)+566/7 = 0
1/7-3*x-6*x+566/7 = 0
81-9*x = 0 // - 81
-9*x = -81 // : -9
x = -81/(-9)
x = 9
x = 9
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