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2-(19+a)=3-11a
We move all terms to the left:
2-(19+a)-(3-11a)=0
We add all the numbers together, and all the variables
-(a+19)-(-11a+3)+2=0
We get rid of parentheses
-a+11a-19-3+2=0
We add all the numbers together, and all the variables
10a-20=0
We move all terms containing a to the left, all other terms to the right
10a=20
a=20/10
a=2
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