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(2*x-6)/4 = 7 // - 7
(2*x-6)/4-7 = 0
(2*x-6)/4+(-7*4)/4 = 0
2*x-7*4-6 = 0
2*x-34 = 0
(2*x-34)/4 = 0
(2*x-34)/4 = 0 // * 4
2*x-34 = 0
2*x-34 = 0 // + 34
2*x = 34 // : 2
x = 34/2
x = 17
x = 17
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