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x in (-oo:+oo)
y-(7/5) = (1/2)*(x-4) // - (1/2)*(x-4)
y-((1/2)*(x-4))-(7/5) = 0
(-1/2)*(x-4)+y-7/5 = 0
y-1/2*(x-4)-7/5 = 0
(-1/2*5*(x-4))/5+(5*y)/5-7/5 = 0
5*y-1/2*5*(x-4)-7 = 0
5*y-5/2*x-7+10 = 0
5*y-5/2*x+3 = 0
(5*y-5/2*x+3)/5 = 0
(5*y-5/2*x+3)/5 = 0 // * 5
5*y-5/2*x+3 = 0
5*y-5/2*x+3 = 0 // - 5*y+3
-5/2*x = -(5*y+3) // : -5/2
x = (-(5*y+3))/(-5/2)
x = 2/5*(5*y+3)
x = 2/5*(5*y+3)
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