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