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