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x in (-oo:+oo)
(1/2)*(6-y)+2*x = 4-x // - 4-x
(1/2)*(6-y)+2*x+x-4 = 0
1/2*(6-y)+2*x+x-4 = 0
1/2*(6-y)+2*x+x-4 = 0
2*x+x-1/2*y-4+3 = 0
3*x-1/2*y-4+3 = 0
3*x-1/2*y-1 = 0
3*x-1/2*y-1 = 0
3*x-1/2*y-1 = 0 // + -1/2*y-1
3*x = -(-1/2*y-1) // : 3
x = (-(-1/2*y-1))/3
x = (1-(-1/2*y))/3
x = (1-(-1/2*y))/3
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