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0.5*8-x = 8-(x/2) // - 8-(x/2)
x/2-x+0.5*8-8 = 0
-1/2*x-4 = 0 // + 4
-1/2*x = 4 // : -1/2
x = 4/(-1/2)
x = -8
x = -8
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