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