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(2/7)*x-(3/5) = -(1/2) // + 1/2
(2/7)*x-(3/5)+1/2 = 0
(2/7)*x-3/5+1/2 = 0
2/7*x-1/10 = 0 // + 1/10
2/7*x = 1/10 // : 2/7
x = 1/10/2/7
x = 7/20
x = 7/20
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