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x in (-oo:+oo)
y = (4*x-10)/5 // - (4*x-10)/5
y-((4*x-10)/5) = 0
(-1*(4*x-10))/5+y = 0
(-1*(4*x-10))/5+(5*y)/5 = 0
5*y-1*(4*x-10) = 0
5*y-4*x+10 = 0
(5*y-4*x+10)/5 = 0
(5*y-4*x+10)/5 = 0 // * 5
5*y-4*x+10 = 0
5*y-4*x+10 = 0 // - 5*y+10
-4*x = -(5*y+10) // : -4
x = (-(5*y+10))/(-4)
x = (5*y+10)/4
x = (5*y+10)/4
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