20a+9=-491

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Solution for 20a+9=-491 equation: 



20a+9=-491

We move all terms to the left:

20a+9-(-491)=0

We add all the numbers together, and all the variables

20a+500=0

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

20a=-500

a=-500/20

a=-25

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