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