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(3*x+4)/2 = 7 // - 7
(3*x+4)/2-7 = 0
(3*x+4)/2+(-7*2)/2 = 0
3*x-7*2+4 = 0
3*x-10 = 0
(3*x-10)/2 = 0
(3*x-10)/2 = 0 // * 2
3*x-10 = 0
3*x-10 = 0 // + 10
3*x = 10 // : 3
x = 10/3
x = 10/3
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