20a-300=100

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Solution for 20a-300=100 equation: 



20a-300=100

We move all terms to the left:

20a-300-(100)=0

We add all the numbers together, and all the variables

20a-400=0

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

20a=400

a=400/20

a=20

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