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-26.1+4.5a=36.9
We move all terms to the left:
-26.1+4.5a-(36.9)=0
We add all the numbers together, and all the variables
4.5a-63=0
We move all terms containing a to the left, all other terms to the right
4.5a=63
a=63/4.5
a=14
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