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-0.25+2a=3a-0.4
We move all terms to the left:
-0.25+2a-(3a-0.4)=0
We get rid of parentheses
2a-3a+0.4-0.25=0
We add all the numbers together, and all the variables
-1a+0.15=0
We move all terms containing a to the left, all other terms to the right
-a=-0.15
a=-0.15/-1
a=0.15/1
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