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-4a+3+5a=9-30
We move all terms to the left:
-4a+3+5a-(9-30)=0
We add all the numbers together, and all the variables
-4a+5a+3-(-21)=0
We add all the numbers together, and all the variables
a+24=0
We move all terms containing a to the left, all other terms to the right
a=-24
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