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66+5a=1-8a
We move all terms to the left:
66+5a-(1-8a)=0
We add all the numbers together, and all the variables
5a-(-8a+1)+66=0
We get rid of parentheses
5a+8a-1+66=0
We add all the numbers together, and all the variables
13a+65=0
We move all terms containing a to the left, all other terms to the right
13a=-65
a=-65/13
a=-5
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