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8 = (4/5)*((1/2)*x-1) // - (4/5)*((1/2)*x-1)
8-((4/5)*((1/2)*x-1)) = 0
(-4/5)*((1/2)*x-1)+8 = 0
8-4/5*(1/2*x-1) = 0
8-4/5*(1/2*x-1) = 0
44/5-2/5*x = 0
44/5-2/5*x = 0
44/5-2/5*x = 0 // - 44/5
-2/5*x = -44/5 // : -2/5
x = -44/5/(-2/5)
x = 22
x = 22
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