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A. 12x + x = 13x
B. 6pq + 5p² - 8pq - p² + pq
=> 5p² - p² + 6pq - 8pq + pq
=> 4p² - pq = p(4p - q)
C. 5y - 10y + 13y
=> -5y + 13y = 8y
b. 4p² - pq
c. 8y