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x in (-oo:+oo)
y = (20-(4*x))/3 // - (20-(4*x))/3
y-((20-(4*x))/3) = 0
y-((20-4*x)/3) = 0
(-1*(20-4*x))/3+y = 0
(-1*(20-4*x))/3+(3*y)/3 = 0
3*y-1*(20-4*x) = 0
4*x+3*y-20 = 0
(4*x+3*y-20)/3 = 0
(4*x+3*y-20)/3 = 0 // * 3
4*x+3*y-20 = 0
4*x+3*y-20 = 0 // - 3*y-20
4*x = -(3*y-20) // : 4
x = (-(3*y-20))/4
x = (20-(3*y))/4
x = (20-(3*y))/4
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