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a-12/11=-3
We move all terms to the left:
a-12/11-(-3)=0
We add all the numbers together, and all the variables
a+3-12/11=0
We multiply all the terms by the denominator
a*11-12+3*11=0
We add all the numbers together, and all the variables
a*11+21=0
Wy multiply elements
11a+21=0
We move all terms containing a to the left, all other terms to the right
11a=-21
a=-21/11
a=-1+10/11
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