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= 12m + 2n + 150
= 2(6m + n + 75)
b) 9a² - 7a² + 18b² + 2b²
= 2a² + 20b²
= 2(a² + 10b²)
c) 12ab - 6ab + 4a - 18a
= 6ab - 14a
= 2a(3b - 7)
d) 8pa² + 12pa - p²q + 5pq + 3p⁴
= 4pa(2pa + 3) - pq(p + 5) + 3p⁴