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6+a/4=-1
We move all terms to the left:
6+a/4-(-1)=0
We add all the numbers together, and all the variables
a/4+7=0
We multiply all the terms by the denominator
a+7*4=0
We add all the numbers together, and all the variables
a+28=0
We move all terms containing a to the left, all other terms to the right
a=-28
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