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x in (-oo:+oo)
(-1/2)*x-(2*y) = -14 // + 14
(-1/2)*x-(2*y)+14 = 0
(-1/2)*x-2*y+14 = 0
14-1/2*x-2*y = 0 // - 14-2*y
-1/2*x = -(14-2*y) // : -1/2
x = (-(14-2*y))/(-1/2)
x = 2*(14-2*y)
x = 2*(14-2*y)
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