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3/5-(x/7) = 4/35 // - 4/35
3/5-(x/7)-(4/35) = 0
3/5-(x/7)-4/35 = 0
17/35-1/7*x = 0 // - 17/35
-1/7*x = -17/35 // : -1/7
x = -17/35/(-1/7)
x = 17/5
x = 17/5
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