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15ab
Since they are like terms, 5a*3a=15a. Find out what "a" is equal to and multiply it by 15. Then, and only then, will you get your answer.
add like terms: 3a -2a -5b + 6b +3b - 7b = a -3b
If a + b = 6, what is the value of 3a + 3b?