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(3*x)/20+1/10 = x/4-(1/5) // - x/4-(1/5)
(3*x)/20-(x/4)+1/10+1/5 = 0
3/10-1/10*x = 0 // - 3/10
-1/10*x = -3/10 // : -1/10
x = -3/10/(-1/10)
x = 3
x = 3
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