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(7*x-4)/3 = 15 // - 15
(7*x-4)/3-15 = 0
(7*x-4)/3+(-15*3)/3 = 0
7*x-15*3-4 = 0
7*x-49 = 0
(7*x-49)/3 = 0
(7*x-49)/3 = 0 // * 3
7*x-49 = 0
7*x-49 = 0 // + 49
7*x = 49 // : 7
x = 49/7
x = 7
x = 7
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