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(1/3)*x+(2/7)*x+2/3 = 48/7 // - 48/7
(1/3)*x+(2/7)*x+2/3-(48/7) = 0
(1/3)*x+(2/7)*x+2/3-48/7 = 0
13/21*x-130/21 = 0 // + 130/21
13/21*x = 130/21 // : 13/21
x = 130/21/13/21
x = 10
x = 10
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