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(7*x-5)/9 = 20 // - 20
(7*x-5)/9-20 = 0
(7*x-5)/9+(-20*9)/9 = 0
7*x-20*9-5 = 0
7*x-185 = 0
(7*x-185)/9 = 0
(7*x-185)/9 = 0 // * 9
7*x-185 = 0
7*x-185 = 0 // + 185
7*x = 185 // : 7
x = 185/7
x = 185/7
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