18m-7+12m
12(m+n)
12m + 3n - 6m + 7n6m + 10n
12m + 2n - 3m + 11n = 9m + 13n
An algebraic expression
-6
If you mean: 12(3+m) then it is the same as 36+12m
m2 + 12m + 20 = ( m + 2)(m + 10)
m(12 + 7n)
The expression 12m + 12n is equal to 12 times the sum of m and n. This expression cannot be simplified further unless there are like terms that can be combined. If m and n are like terms, then the expression can be further simplified by factoring out the common factor of 12 to get 12(m + n).
12m + 9n - 4 - 10m + 6n = 2m + 15n - 4
4(3m - 4)