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(1/7)*x+1/4 = x-(13/140) // - x-(13/140)
(1/7)*x-x+1/4+13/140 = 0
12/35-6/7*x = 0 // - 12/35
-6/7*x = -12/35 // : -6/7
x = -12/35/(-6/7)
x = 2/5
x = 2/5
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