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6=a-2.5
We move all terms to the left:
6-(a-2.5)=0
We get rid of parentheses
-a+2.5+6=0
We add all the numbers together, and all the variables
-1a+8.5=0
We move all terms containing a to the left, all other terms to the right
-a=-8.5
a=-8.5/-1
a=8+0.5/1
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