3-4a-7=-20

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Solution for 3-4a-7=-20 equation: 



3-4a-7=-20

We move all terms to the left:

3-4a-7-(-20)=0

We add all the numbers together, and all the variables

-4a+16=0

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

-4a=-16

a=-16/-4

a=+4

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