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2.5a+(-5a+2)=1
We move all terms to the left:
2.5a+(-5a+2)-(1)=0
We get rid of parentheses
2.5a-5a+2-1=0
We add all the numbers together, and all the variables
-2.5a+1=0
We move all terms containing a to the left, all other terms to the right
-2.5a=-1
a=-1/-2.5
a=1/2.5
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