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x in (-oo:+oo)
x = (630-y)/2 // - (630-y)/2
x-((630-y)/2) = 0
(-1*(630-y))/2+x = 0
(-1*(630-y))/2+(2*x)/2 = 0
2*x-1*(630-y) = 0
2*x+y-630 = 0
(2*x+y-630)/2 = 0
(2*x+y-630)/2 = 0 // * 2
2*x+y-630 = 0
2*x+y-630 = 0 // - y-630
2*x = -(y-630) // : 2
x = (-(y-630))/2
x = (630-y)/2
x = (630-y)/2
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