3a=100-10

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Solution for 3a=100-10 equation: 



3a=100-10

We move all terms to the left:

3a-(100-10)=0

We add all the numbers together, and all the variables

3a-90=0

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

3a=90

a=90/3

a=30

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