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