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(1/3)*x+4/3 = 7 // - 7
(1/3)*x+4/3-7 = 0
1/3*x-17/3 = 0 // + 17/3
1/3*x = 17/3 // : 1/3
x = 17/3/1/3
x = 17
x = 17
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