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