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5.25a-2(3a+1.25)=a-1
We move all terms to the left:
5.25a-2(3a+1.25)-(a-1)=0
We multiply parentheses
5.25a-6a-(a-1)-2.5=0
We get rid of parentheses
5.25a-6a-a+1-2.5=0
We add all the numbers together, and all the variables
-1.75a-1.5=0
We move all terms containing a to the left, all other terms to the right
-1.75a=1.5
a=1.5/-1.75
a=-1/1.1666666666667
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