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-13.85=-1.6-3.5a
We move all terms to the left:
-13.85-(-1.6-3.5a)=0
We add all the numbers together, and all the variables
-(-3.5a-1.6)-13.85=0
We get rid of parentheses
3.5a+1.6-13.85=0
We add all the numbers together, and all the variables
3.5a-12.25=0
We move all terms containing a to the left, all other terms to the right
3.5a=12.25
a=12.25/3.5
a=3+1/2
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