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(1/2)*x-6 = 3*y // - 3*y
(1/2)*x-(3*y)-6 = 0
(1/2)*x-3*y-6 = 0
1/2*x-3*y-6 = 0 // + -3*y-6
1/2*x = -(-3*y-6) // : 1/2
x = (-(-3*y-6))/1/2
x = 2*(6-(-3*y))
x = 2*(6-(-3*y))
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