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-15.4=-0.0035a=70
We move all terms to the left:
-15.4-(-0.0035a)=0
We get rid of parentheses
0.0035a-15.4=0
We move all terms containing a to the left, all other terms to the right
0.0035a=15.4
a=15.4/0.0035
a=4400
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