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x in (-oo:+oo)
(1/2)*x-g = m // - m
(1/2)*x-g-m = 0
1/2*x-g-m = 0 // + -g-m
1/2*x = -(-g-m) // : 1/2
x = (-(-g-m))/1/2
x = 2*(g+m)
x = 2*(g+m)
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