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(2*x)/7 = 3/12 // - 3/12
(2*x)/7-(3/12) = 0
(2*x)/7-1/4 = 0
2/7*x-1/4 = 0 // + 1/4
2/7*x = 1/4 // : 2/7
x = 1/4/2/7
x = 7/8
x = 7/8
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