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(7*x)/10+1/2 = 13/10 // - 13/10
(7*x)/10+1/2-(13/10) = 0
(7*x)/10+1/2-13/10 = 0
7/10*x-4/5 = 0 // + 4/5
7/10*x = 4/5 // : 7/10
x = 4/5/7/10
x = 8/7
x = 8/7
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