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-3(1+14a)+13a=-3(1-12)
We move all terms to the left:
-3(1+14a)+13a-(-3(1-12))=0
We add all the numbers together, and all the variables
-3(14a+1)+13a-(-3(-11))=0
We add all the numbers together, and all the variables
13a-3(14a+1)-33=0
We multiply parentheses
13a-42a-3-33=0
We add all the numbers together, and all the variables
-29a-36=0
We move all terms containing a to the left, all other terms to the right
-29a=36
a=36/-29
a=-1+7/29
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