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x in (-oo:+oo)
(1/4)*y-(3*x) = 9 // - 9
(1/4)*y-(3*x)-9 = 0
(1/4)*y-3*x-9 = 0
1/4*y-3*x-9 = 0 // - 1/4*y-9
-3*x = -(1/4*y-9) // : -3
x = (-(1/4*y-9))/(-3)
x = (9-(1/4*y))/(-3)
x = (9-(1/4*y))/(-3)
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