4=-5a+7a

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Solution for 4=-5a+7a equation: 



4=-5a+7a

We move all terms to the left:

4-(-5a+7a)=0

We add all the numbers together, and all the variables

-(+2a)+4=0

We get rid of parentheses

-2a+4=0

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

-2a=-4

a=-4/-2

a=+2

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