Given: Q = 7m + 3n, R = 11 - 2m, S = n + 5, and T = - m - 3n + 8.

Simplify [Q - R] + [S - T].

10m + 5n - 24

10m - 5n + 24

10m + 7n - 14

10m - 7n - 14

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How I can simplifying 28x13x25