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2/5-((6/7)*x) = 104/35 // - 104/35
2/5-((6/7)*x)-(104/35) = 0
(-6/7)*x+2/5-104/35 = 0
-6/7*x-18/7 = 0 // + 18/7
-6/7*x = 18/7 // : -6/7
x = 18/7/(-6/7)
x = -3
x = -3
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