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12.8*(x/2) = 8*x-16 // - 8*x-16
12.8*(x/2)-(8*x)+16 = 0
12.8*(x/2)-8*x+16 = 0
16-1.6*x = 0 // - 16
-1.6*x = -16 // : -1.6
x = -16/(-1.6)
x = 10
x = 10
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