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a=10a-45
We move all terms to the left:
a-(10a-45)=0
We get rid of parentheses
a-10a+45=0
We add all the numbers together, and all the variables
-9a+45=0
We move all terms containing a to the left, all other terms to the right
-9a=-45
a=-45/-9
a=+5
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