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2a+4=16-39
We move all terms to the left:
2a+4-(16-39)=0
We add all the numbers together, and all the variables
2a+4-(-23)=0
We add all the numbers together, and all the variables
2a+27=0
We move all terms containing a to the left, all other terms to the right
2a=-27
a=-27/2
a=-13+1/2
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