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153=a+4a+4a+45
We move all terms to the left:
153-(a+4a+4a+45)=0
We add all the numbers together, and all the variables
-(9a+45)+153=0
We get rid of parentheses
-9a-45+153=0
We add all the numbers together, and all the variables
-9a+108=0
We move all terms containing a to the left, all other terms to the right
-9a=-108
a=-108/-9
a=+12
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