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107=8-9a
We move all terms to the left:
107-(8-9a)=0
We add all the numbers together, and all the variables
-(-9a+8)+107=0
We get rid of parentheses
9a-8+107=0
We add all the numbers together, and all the variables
9a+99=0
We move all terms containing a to the left, all other terms to the right
9a=-99
a=-99/9
a=-11
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