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70=4a-4
We move all terms to the left:
70-(4a-4)=0
We get rid of parentheses
-4a+4+70=0
We add all the numbers together, and all the variables
-4a+74=0
We move all terms containing a to the left, all other terms to the right
-4a=-74
a=-74/-4
a=18+1/2
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