To simplify the expression 3n + 15t - 2n + 20m + 7n - 15m, we can combine like terms:
3n - 2n + 7n = 8n15t20m - 15m = 5m
Therefore, the simplified expression is:
8n + 15t + 5m
To simplify the expression 3n + 15t - 2n + 20m + 7n - 15m, we can combine like terms:
3n - 2n + 7n = 8n
15t
20m - 15m = 5m
Therefore, the simplified expression is:
8n + 15t + 5m