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2/3+4/7 = x/5 // - x/5
2/3-(x/5)+4/7 = 0
26/21-1/5*x = 0 // - 26/21
-1/5*x = -26/21 // : -1/5
x = -26/21/(-1/5)
x = 130/21
x = 130/21
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