a+20+2a-30=400

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Solution for a+20+2a-30=400 equation: 



a+20+2a-30=400

We move all terms to the left:

a+20+2a-30-(400)=0

We add all the numbers together, and all the variables

3a-410=0

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

3a=410

a=410/3

a=136+2/3

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