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-4a+4+5a=10-27
We move all terms to the left:
-4a+4+5a-(10-27)=0
We add all the numbers together, and all the variables
-4a+5a+4-(-17)=0
We add all the numbers together, and all the variables
a+21=0
We move all terms containing a to the left, all other terms to the right
a=-21
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