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15a-54=9-9-
We move all terms to the left:
15a-54-(9-9-)=0
We add all the numbers together, and all the variables
15a-54-0=0
We add all the numbers together, and all the variables
15a-54=0
We move all terms containing a to the left, all other terms to the right
15a=54
a=54/15
a=3+3/5
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