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(2/7)*x+(3/7)*x+1/5 = 22/35 // - 22/35
(2/7)*x+(3/7)*x+1/5-(22/35) = 0
(2/7)*x+(3/7)*x+1/5-22/35 = 0
5/7*x-3/7 = 0 // + 3/7
5/7*x = 3/7 // : 5/7
x = 3/7/5/7
x = 3/5
x = 3/5
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