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