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x/5+1/2 = x/2+4/5 // - x/2+4/5
x/5-(x/2)+1/2-(4/5) = 0
x/5-(x/2)+1/2-4/5 = 0
-3/10*x-3/10 = 0 // + 3/10
-3/10*x = 3/10 // : -3/10
x = 3/10/(-3/10)
x = -1
x = -1
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