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(5/7)*x+(2/14)*x = 36/14 // - 36/14
(5/7)*x+(2/14)*x-(36/14) = 0
(5/7)*x+(2/14)*x-18/7 = 0
6/7*x-18/7 = 0 // + 18/7
6/7*x = 18/7 // : 6/7
x = 18/7/6/7
x = 3
x = 3
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