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-22=-12+a
We move all terms to the left:
-22-(-12+a)=0
We add all the numbers together, and all the variables
-(a-12)-22=0
We get rid of parentheses
-a+12-22=0
We add all the numbers together, and all the variables
-1a-10=0
We move all terms containing a to the left, all other terms to the right
-a=10
a=10/-1
a=-10
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