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(1/2)*(x-3) = 2*y // - 2*y
(1/2)*(x-3)-(2*y) = 0
(1/2)*(x-3)-2*y = 0
1/2*(x-3)-2*y = 0
1/2*(x-3)-2*y = 0
1/2*x-2*y-3/2 = 0
1/2*x-2*y-3/2 = 0
1/2*x-2*y-3/2 = 0 // + -2*y-3/2
1/2*x = -(-2*y-3/2) // : 1/2
x = (-(-2*y-3/2))/1/2
x = 2*(3/2-(-2*y))
x = 2*(3/2-(-2*y))
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