If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x-(2/2) = m+n // - m+n
x-m-n-(2/2) = 0
x-m-n-1 = 0
x-m-n-1 = 0 // + -m-n-1
x = -(-m-n-1)
x = m+n+1
x = m+n+1
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