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2m+12n-m-\left(m-2n\right)
Combine 9n and 3n to get 12n.
m+12n-\left(m-2n\right)
Combine 2m and -m to get m.
m+12n-m-\left(-2n\right)
To find the opposite of m-2n, find the opposite of each term.
m+12n-m+2n
The opposite of -2n is 2n.
12n+2n
Combine m and -m to get 0.
14n
Combine 12n and 2n to get 14n.
2m+12n-m-\left(m-2n\right)
Combine 9n and 3n to get 12n.
m+12n-\left(m-2n\right)
Combine 2m and -m to get m.
m+12n-m-\left(-2n\right)
To find the opposite of m-2n, find the opposite of each term.
m+12n-m+2n
The opposite of -2n is 2n.
12n+2n
Combine m and -m to get 0.
14n
Combine 12n and 2n to get 14n.