Collect like terms 12p+4q-5p-9q=

I dont'know how to collect like terms, please help.

(12p-5p)+(4q-9q)

7p -5q

-3 · -u · -7v + 8v - 6uv

To collect like terms, you need to combine the terms that have the same variable(s) and exponent(s). Let's go step by step with the given expression, 12p + 4q - 5p - 9q.

Step 1: Group the terms with the same variable, p, together.
12p - 5p + 4q - 9q

Step 2: Combine the coefficients (numbers) of the like terms.
(12 - 5)p + (4 - 9)q

Step 3: Simplify the expression by performing the numerical operation.
7p - 5q

Therefore, the simplified expression, after collecting like terms, is 7p - 5q.