7a-5a-5+3a=-20

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Solution for 7a-5a-5+3a=-20 equation: 



7a-5a-5+3a=-20

We move all terms to the left:

7a-5a-5+3a-(-20)=0

We add all the numbers together, and all the variables

5a+15=0

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

5a=-15

a=-15/5

a=-3

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