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Simplify each of the expressions: 15 a^2...

Simplify each of the expressions: `15 a^2-6a(a-2)+a(3+7a)`

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`15 a^2-6a(a-2)+a(3+7a)`
`=15a^2-6a^2+12a+3a+7a^2`
`=16a^2+15a`
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