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3*(x+7)-(5/6) = 0
3*(x+7)-5/6 = 0
(3*6*(x+7))/6-5/6 = 0
3*6*(x+7)-5 = 0
18*x+121 = 0
(18*x+121)/6 = 0
(18*x+121)/6 = 0 // * 6
18*x+121 = 0
18*x+121 = 0 // - 121
18*x = -121 // : 18
x = -121/18
x = -121/18
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