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-2+a/4=-1
We move all terms to the left:
-2+a/4-(-1)=0
We add all the numbers together, and all the variables
a/4-1=0
We multiply all the terms by the denominator
a-1*4=0
We add all the numbers together, and all the variables
a-4=0
We move all terms containing a to the left, all other terms to the right
a=4
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