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1/4-((1/7)*x) = 5/7 // - 5/7
1/4-((1/7)*x)-(5/7) = 0
(-1/7)*x+1/4-5/7 = 0
-1/7*x-13/28 = 0 // + 13/28
-1/7*x = 13/28 // : -1/7
x = 13/28/(-1/7)
x = -13/4
x = -13/4
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