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x in (-oo:+oo)
1-((x-7)/2) = y // - y
1-((x-7)/2)-y = 0
(-1*(x-7))/2-y+1 = 0
(-1*(x-7))/2+(2*(-y))/2+(1*2)/2 = 0
2*(-y)-1*(x-7)+1*2 = 0
2-x-2*y+7 = 0
9-x-2*y = 0
(9-x-2*y)/2 = 0
(9-x-2*y)/2 = 0 // * 2
9-x-2*y = 0
9-x-2*y = 0 // - 9-2*y
-x = -(9-2*y) // * -1
x = 9-2*y
x = 9-2*y
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