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21/3-(x/4) = 5/6 // - 5/6
21/3-(x/4)-(5/6) = 0
21/3-(x/4)-5/6 = 0
37/6-1/4*x = 0 // - 37/6
-1/4*x = -37/6 // : -1/4
x = -37/6/(-1/4)
x = 74/3
x = 74/3
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