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-8a+14=-7a-1
We move all terms to the left:
-8a+14-(-7a-1)=0
We get rid of parentheses
-8a+7a+1+14=0
We add all the numbers together, and all the variables
-1a+15=0
We move all terms containing a to the left, all other terms to the right
-a=-15
a=-15/-1
a=+15
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