12.5=-0.5+4a

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Solution for 12.5=-0.5+4a equation: 



12.5=-0.5+4a

We move all terms to the left:

12.5-(-0.5+4a)=0

We add all the numbers together, and all the variables

-(4a-0.5)+12.5=0

We get rid of parentheses

-4a+0.5+12.5=0

We add all the numbers together, and all the variables

-4a+13=0

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

-4a=-13

a=-13/-4

a=3+1/4

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