3a-7a=20

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Solution for 3a-7a=20 equation: 



3a-7a=20

We move all terms to the left:

3a-7a-(20)=0

We add all the numbers together, and all the variables

-4a-20=0

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

-4a=20

a=20/-4

a=-5

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