20.5a-6=-0.5a+9

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Solution for 20.5a-6=-0.5a+9 equation: 



20.5a-6=-0.5a+9

We move all terms to the left:

20.5a-6-(-0.5a+9)=0

We get rid of parentheses

20.5a+0.5a-9-6=0

We add all the numbers together, and all the variables

21a-15=0

We move all terms containing a to the left, all other terms to the right

21a=15

a=15/21

a=5/7

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