Question 208173
2d^2 + 3d^2 - 4e^2 - 5e^2

I know (2d^2 + 3d^2) = 5d^2 

but is the next part of the equation 
-(4e^2 - 5e^2) = -1e^2 or
+(-4e^2 - 5e^2) = -9e^2  

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-4e^2 -5e^2 = -9e^2
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Cheers,
Stan H.