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