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
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6m + 5n - 4m + 7n = 2m + 12n
14M + 2n - 6M + 11n = 8M + 13n
2m + 13n
1m2 + m = m(m + 1)
6m + m + m + 4y + n + y + 12 + 2n Group like terms: 6m + m + m + 2n + n + 4y + y + 12 Add: 8m + 3n + 5y + 12