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2a + 10 + 5a - 2 = (2a + 5a) + (10 - 2) = 7a + 8
The GCF is a^2.
5a³ - 4ab + 2a³ = (5+2)a³ - 4ab = 7a³ - 4ab.
It simplifies to 5a+4 !
2a+5