3a+-a=-20

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



3a+-a=-20

We move all terms to the left:

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

We add all the numbers together, and all the variables

2a+20=0

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

2a=-20

a=-20/2

a=-10

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