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21 = (6/100)*x // - (6/100)*x
21-((6/100)*x) = 0
(-3/50)*x+21 = 0
21-3/50*x = 0 // - 21
-3/50*x = -21 // : -3/50
x = -21/(-3/50)
x = 350
x = 350
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