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21-(1/4) = x/3 // - x/3
21-(x/3)-(1/4) = 0
21-(x/3)-1/4 = 0
83/4-1/3*x = 0 // - 83/4
-1/3*x = -83/4 // : -1/3
x = -83/4/(-1/3)
x = 249/4
x = 249/4
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