If by "1m2" you mean 1 square meter, there is no answeras 6m (six meters) is a linear measurement and 1m2 (one square meter) is an area measurement and you cannot add different dimensions. - for example you cannot add an inch to a pint either!
If by 1m2 you mean 1,2 m (one and two tenths meters) the answer is 7,2m
6m + 5n - 4m + 7n = 2m + 12n
14M + 2n - 6M + 11n = 8M + 13n
1m2 + m = m(m + 1)
2m + 13n
6m + m + m + 4y + n + y + 12 + 2n Group like terms: 6m + m + m + 2n + n + 4y + y + 12 Add: 8m + 3n + 5y + 12
12m + 3n - 6m + 7n6m + 10n
15m + (2n-6m) + 11m = = 15m + 11m + 2n - 6m = 26m - 6m + 2n = 20m + 2n = 2(10m + n)
6m + 5n - 4m + 7n = 2m + 12n
14M + 2n - 6M + 11n = 8M + 13n
6m + 7 - 2m + 1 = 4m + 8 If you meant: (6m + 7) - (2m + 1) = 4m + 6
8m + (4n - 6m) + 9n =8m + 4n - 6m + 9n =(8m - 6m) + (4n + 9n) =2m + 13n
-8 + (5m - 6m) = -8 + (-m) = -8 - m
1m2 + m = m(m + 1)
2m + 13n
6m + m + m + 4y + n + y + 12 + 2n Group like terms: 6m + m + m + 2n + n + 4y + y + 12 Add: 8m + 3n + 5y + 12
11
6m + 20 = 9m - 4 24 = 3m m = 8