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-21-8a=-1+6(4a-5a)
We move all terms to the left:
-21-8a-(-1+6(4a-5a))=0
We add all the numbers together, and all the variables
-8a-(-1+6(-1a))-21=0
We calculate terms in parentheses: -(-1+6(-1a)), so:We get rid of parentheses
-1+6(-1a)
determiningTheFunctionDomain 6(-1a)-1
We multiply parentheses
-6a-1
Back to the equation:
-(-6a-1)
-8a+6a+1-21=0
We add all the numbers together, and all the variables
-2a-20=0
We move all terms containing a to the left, all other terms to the right
-2a=20
a=20/-2
a=-10
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