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(3*x)/7+x/2 = 26/14 // - 26/14
(3*x)/7+x/2-(26/14) = 0
(3*x)/7+x/2-13/7 = 0
13/14*x-13/7 = 0 // + 13/7
13/14*x = 13/7 // : 13/14
x = 13/7/13/14
x = 2
x = 2
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