3a-100=a+100

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Solution for 3a-100=a+100 equation: 



3a-100=a+100

We move all terms to the left:

3a-100-(a+100)=0

We get rid of parentheses

3a-a-100-100=0

We add all the numbers together, and all the variables

2a-200=0

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

2a=200

a=200/2

a=100

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