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20=-4+3(a-11)=23
We move all terms to the left:
20-(-4+3(a-11))=0
We calculate terms in parentheses: -(-4+3(a-11)), so:We get rid of parentheses
-4+3(a-11)
determiningTheFunctionDomain 3(a-11)-4
We multiply parentheses
3a-33-4
We add all the numbers together, and all the variables
3a-37
Back to the equation:
-(3a-37)
-3a+37+20=0
We add all the numbers together, and all the variables
-3a+57=0
We move all terms containing a to the left, all other terms to the right
-3a=-57
a=-57/-3
a=+19
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