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1/4+1/5 = x/2 // - x/2
1/4-(x/2)+1/5 = 0
9/20-1/2*x = 0 // - 9/20
-1/2*x = -9/20 // : -1/2
x = -9/20/(-1/2)
x = 9/10
x = 9/10
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