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.10-15a=25-20a
We move all terms to the left:
.10-15a-(25-20a)=0
We add all the numbers together, and all the variables
-15a-(-20a+25)+.10=0
We add all the numbers together, and all the variables
-15a-(-20a+25)+0.1=0
We get rid of parentheses
-15a+20a-25+0.1=0
We add all the numbers together, and all the variables
5a-24.9=0
We move all terms containing a to the left, all other terms to the right
5a=24.9
a=24.9/5
a=4+2.5789473684211/2.6315789473684
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