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2a + 10 + 5a - 2 = (2a + 5a) + (10 - 2) = 7a + 8
Whan a = 2 and b = 6, 5a + 2b = 5*2 + 2*6 = 10 + 12 = 22
5a plus 2b
6+7a+6b
5a³ - 4ab + 2a³ = (5+2)a³ - 4ab = 7a³ - 4ab.