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x in (-oo:+oo)
(1/3)*x+(1/4)*y = 12 // - 12
(1/3)*x+(1/4)*y-12 = 0
1/3*x+1/4*y-12 = 0 // - 1/4*y-12
1/3*x = -(1/4*y-12) // : 1/3
x = (-(1/4*y-12))/1/3
x = 3*(12-(1/4*y))
x = 3*(12-(1/4*y))
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