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(4*x)/y = 2*(x+1) // - 2*(x+1)
(4*x)/y-(2*(x+1)) = 0
(4*x)/y-2*(x+1) = 0
(-2*y*(x+1))/y+(4*x)/y = 0
4*x-2*y*(x+1) = 0
4*x-2*x*y-2*y = 0
4*x-2*x*y-2*y = 0
2*(2*x-(x*y)-y) = 0
2*x-y = 0 // + y
2*x = y // : 2
x = y/2
2*(x-1/2*y) = 0
(2*(x-1/2*y))/y = 0
(2*(x-1/2*y))/y = 0 // * y
2*(x-1/2*y) = 0
x-1/2*y = 0 // + -1/2*y
x = -(-1/2*y)
x = 1/2*y
x = 1/2*y
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