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(3*x)/7-(2/7)-(10/7) = 0
(3*x)/7-2/7-10/7 = 0
3/7*x-12/7 = 0 // + 12/7
3/7*x = 12/7 // : 3/7
x = 12/7/3/7
x = 4
x = 4
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