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x in (-oo:+oo)
12*y-((6*x)/4) = 20 // - 20
12*y-((6*x)/4)-20 = 0
(-3/2)*x+12*y-20 = 0
12*y-3/2*x-20 = 0 // - 12*y-20
-3/2*x = -(12*y-20) // : -3/2
x = (-(12*y-20))/(-3/2)
x = -2/3*(20-(12*y))
x = -2/3*(20-(12*y))
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