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(7*x)/3+(4*x)/2 = 28 // - 28
(7*x)/3+(4*x)/2-28 = 0
13/3*x-28 = 0 // + 28
13/3*x = 28 // : 13/3
x = 28/13/3
x = 84/13
x = 84/13
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