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312=a+0.25a
We move all terms to the left:
312-(a+0.25a)=0
We add all the numbers together, and all the variables
-(+1.25a)+312=0
We get rid of parentheses
-1.25a+312=0
We move all terms containing a to the left, all other terms to the right
-1.25a=-312
a=-312/-1.25
a=249+0.75/1.25
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