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Anonymous
lcm(9a, 15a²) = 45a²
Factorising:
9a = 3² × a
15a² = 3 × 5 × a²
lcm = 3² × 5 × a² = 45a²
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9a-99 = -90
9a - 8a = a
9a squared = 81a^2
9a+21 3(3a+7)
12a + 6b + 9a + 14b =(12a + 9a) + (6b + 14b) =21a + 20b