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2(a+5)+4(2a+3)-10:
First, distribute the 2 and 4:
2(a) + 2(5) + 4(2a) + 4(3) - 10
Simplify:
2a + 10 + 8a + 12 - 10
Combine like terms:
(2a + 8a) + (10 + 12 - 10)
10a + 12
Final expression: 10a + 12