3a-100=a

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Solution for 3a-100=a equation: 



3a-100=a

We move all terms to the left:

3a-100-(a)=0

We add all the numbers together, and all the variables

2a-100=0

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

2a=100

a=100/2

a=50

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