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(2/3)*(9*x-7) = 80/6 // - 80/6
(2/3)*(9*x-7)-(80/6) = 0
(2/3)*(9*x-7)-40/3 = 0
2/3*(9*x-7)-40/3 = 0
(2/3*3*(9*x-7))/3-40/3 = 0
2/3*3*(9*x-7)-40 = 0
18*x-54 = 0
(18*x-54)/3 = 0
(18*x-54)/3 = 0 // * 3
18*x-54 = 0
18*x-54 = 0 // + 54
18*x = 54 // : 18
x = 54/18
x = 3
x = 3
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