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5=45+2a
We move all terms to the left:
5-(45+2a)=0
We add all the numbers together, and all the variables
-(2a+45)+5=0
We get rid of parentheses
-2a-45+5=0
We add all the numbers together, and all the variables
-2a-40=0
We move all terms containing a to the left, all other terms to the right
-2a=40
a=40/-2
a=-20
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