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(6/7)*x = 5-((13/14)*x) // - 5-((13/14)*x)
(6/7)*x+(13/14)*x-5 = 0
25/14*x-5 = 0 // + 5
25/14*x = 5 // : 25/14
x = 5/25/14
x = 14/5
x = 14/5
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