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