You can put this solution on YOUR website! What propertys are
3c+5(2+c)=3c+5(2)+5c:::distributive
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=3c+5c+5(2):::commutative
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=(3c+5c)+5(2):::associative
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=(3+5)c+5(2)::::distributive
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=8c+10::::identity
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Cheers,
Stan H.