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27=19-2a
We move all terms to the left:
27-(19-2a)=0
We add all the numbers together, and all the variables
-(-2a+19)+27=0
We get rid of parentheses
2a-19+27=0
We add all the numbers together, and all the variables
2a+8=0
We move all terms containing a to the left, all other terms to the right
2a=-8
a=-8/2
a=-4
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