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-71.9=-0.0035a+10
We move all terms to the left:
-71.9-(-0.0035a+10)=0
We get rid of parentheses
0.0035a-10-71.9=0
We add all the numbers together, and all the variables
0.0035a-81.9=0
We move all terms containing a to the left, all other terms to the right
0.0035a=81.9
a=81.9/0.0035
a=23400
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