Simplify 9.6m+7.22n+(-2.19m)+(-0.65n)

$9.6 m + 7.22 n + (- 2.19 m) + (- 0.65 n)$

Remove parentheses.

$9.6 m + 7.22 n - 2.19 m - 0.65 n$

Subtract $2.19 m$ from $9.6 m$ .

$7.41 m + 7.22 n - 0.65 n$

Subtract $0.65 n$ from $7.22 n$ .

$7.41 m + 6.57 n$