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