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3/7-((4/7)*x) = 5/14 // - 5/14
3/7-((4/7)*x)-(5/14) = 0
(-4/7)*x+3/7-5/14 = 0
1/14-4/7*x = 0 // - 1/14
-4/7*x = -1/14 // : -4/7
x = -1/14/(-4/7)
x = 1/8
x = 1/8
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