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x in (-oo:+oo)
y = (600-(9*x))/10 // - (600-(9*x))/10
y-((600-(9*x))/10) = 0
y-((600-9*x)/10) = 0
(-1*(600-9*x))/10+y = 0
(-1*(600-9*x))/10+(10*y)/10 = 0
10*y-1*(600-9*x) = 0
9*x+10*y-600 = 0
(9*x+10*y-600)/10 = 0
(9*x+10*y-600)/10 = 0 // * 10
9*x+10*y-600 = 0
9*x+10*y-600 = 0 // - 10*y-600
9*x = -(10*y-600) // : 9
x = (-(10*y-600))/9
x = (600-(10*y))/9
x = (600-(10*y))/9
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