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