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x/6-((3*x)/8) = x/2-(21/3) // - x/2-(21/3)
x/6-((3*x)/8)-(x/2)+21/3 = 0
x/6+(-3/8)*x-(x/2)+21/3 = 0
7-17/24*x = 0 // - 7
-17/24*x = -7 // : -17/24
x = -7/(-17/24)
x = 168/17
x = 168/17
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