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-6a+6=1-13
We move all terms to the left:
-6a+6-(1-13)=0
We add all the numbers together, and all the variables
-6a+6-(-12)=0
We add all the numbers together, and all the variables
-6a+18=0
We move all terms containing a to the left, all other terms to the right
-6a=-18
a=-18/-6
a=+3
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