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(7*x)/10+1/5 = 13/20 // - 13/20
(7*x)/10+1/5-(13/20) = 0
(7*x)/10+1/5-13/20 = 0
7/10*x-9/20 = 0 // + 9/20
7/10*x = 9/20 // : 7/10
x = 9/20/7/10
x = 9/14
x = 9/14
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