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