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3a+1=-3.1(a-1)
We move all terms to the left:
3a+1-(-3.1(a-1))=0
We calculate terms in parentheses: -(-3.1(a-1)), so:We get rid of parentheses
-3.1(a-1)
We multiply parentheses
-3.1a+3.1
Back to the equation:
-(-3.1a+3.1)
3a+3.1a-3.1+1=0
We add all the numbers together, and all the variables
6.1a-2.1=0
We move all terms containing a to the left, all other terms to the right
6.1a=2.1
a=2.1/6.1
a=1/2.90476190476
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