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x+(3/7)*x+2/3 = 74/21 // - 74/21
x+(3/7)*x+2/3-(74/21) = 0
x+(3/7)*x+2/3-74/21 = 0
10/7*x-20/7 = 0 // + 20/7
10/7*x = 20/7 // : 10/7
x = 20/7/10/7
x = 2
x = 2
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