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