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3a=-20-7
We move all terms to the left:
3a-(-20-7)=0
We add all the numbers together, and all the variables
3a-(-27)=0
We add all the numbers together, and all the variables
3a+27=0
We move all terms containing a to the left, all other terms to the right
3a=-27
a=-27/3
a=-9
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