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x in (-oo:+oo)
y = (235-(8*x))/5 // - (235-(8*x))/5
y-((235-(8*x))/5) = 0
y-((235-8*x)/5) = 0
(-1*(235-8*x))/5+y = 0
(-1*(235-8*x))/5+(5*y)/5 = 0
5*y-1*(235-8*x) = 0
8*x+5*y-235 = 0
(8*x+5*y-235)/5 = 0
(8*x+5*y-235)/5 = 0 // * 5
8*x+5*y-235 = 0
8*x+5*y-235 = 0 // - 5*y-235
8*x = -(5*y-235) // : 8
x = (-(5*y-235))/8
x = (235-(5*y))/8
x = (235-(5*y))/8
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