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-0.4a+0.5=-2a+0.1
We move all terms to the left:
-0.4a+0.5-(-2a+0.1)=0
We get rid of parentheses
-0.4a+2a-0.1+0.5=0
We add all the numbers together, and all the variables
1.6a+0.4=0
We move all terms containing a to the left, all other terms to the right
1.6a=-0.4
a=-0.4/1.6
a=-0.4/1.6
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