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x-x-(3/20)-4 = x/8 // - x/8
x-x-(x/8)-(3/20)-4 = 0
x-x-(x/8)-3/20-4 = 0
-1/8*x-83/20 = 0 // + 83/20
-1/8*x = 83/20 // : -1/8
x = 83/20/(-1/8)
x = -166/5
x = -166/5
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