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(3*x-5)/10 = 7 // - 7
(3*x-5)/10-7 = 0
(3*x-5)/10+(-7*10)/10 = 0
3*x-7*10-5 = 0
3*x-75 = 0
(3*x-75)/10 = 0
(3*x-75)/10 = 0 // * 10
3*x-75 = 0
3*x-75 = 0 // + 75
3*x = 75 // : 3
x = 75/3
x = 25
x = 25
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