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(7/10)*x+1/2 = 13/20 // - 13/20
(7/10)*x+1/2-(13/20) = 0
(7/10)*x+1/2-13/20 = 0
7/10*x-3/20 = 0 // + 3/20
7/10*x = 3/20 // : 7/10
x = 3/20/7/10
x = 3/14
x = 3/14
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