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