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a+6=-a-4
We move all terms to the left:
a+6-(-a-4)=0
We add all the numbers together, and all the variables
a-(-1a-4)+6=0
We get rid of parentheses
a+1a+4+6=0
We add all the numbers together, and all the variables
2a+10=0
We move all terms containing a to the left, all other terms to the right
2a=-10
a=-10/2
a=-5
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