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3*x+4*x+4/2+2/3 = 12 // - 12
3*x+4*x+4/2+2/3-12 = 0
7*x-28/3 = 0 // + 28/3
7*x = 28/3 // : 7
x = 28/3/7
x = 4/3
x = 4/3
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