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(50/3)/2 = x/20 // - x/20
(50/3)/2-(x/20) = 0
25/3-1/20*x = 0 // - 25/3
-1/20*x = -25/3 // : -1/20
x = -25/3/(-1/20)
x = 500/3
x = 500/3
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