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