80=45+a

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Solution for 80=45+a equation: 



80=45+a

We move all terms to the left:

80-(45+a)=0

We add all the numbers together, and all the variables

-(a+45)+80=0

We get rid of parentheses

-a-45+80=0

We add all the numbers together, and all the variables

-1a+35=0

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

-a=-35

a=-35/-1

a=+35

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