20-a=-4

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Solution for 20-a=-4 equation: 



20-a=-4

We move all terms to the left:

20-a-(-4)=0

We add all the numbers together, and all the variables

-1a+24=0

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

-a=-24

a=-24/-1

a=+24

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