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Mathematics
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Simplify: (-3a-4b)-(-9a-4b) 6a2 6a 6a2+6b2 6a+6b
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you got what?
if you're completely stuck, then you can distribute to go from (-3a-4b)-(-9a-4b) to -3a-4b+9a+4b now you just need to combine like terms
I got d
-3a+9a is 6a
but -4b+4b isn't 6b
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