-4a+20+7a=13a-40

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Solution for -4a+20+7a=13a-40 equation: 



-4a+20+7a=13a-40

We move all terms to the left:

-4a+20+7a-(13a-40)=0

We add all the numbers together, and all the variables

3a-(13a-40)+20=0

We get rid of parentheses

3a-13a+40+20=0

We add all the numbers together, and all the variables

-10a+60=0

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

-10a=-60

a=-60/-10

a=+6

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