3a-3=13a-123

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Solution for 3a-3=13a-123 equation: 



3a-3=13a-123

We move all terms to the left:

3a-3-(13a-123)=0

We get rid of parentheses

3a-13a+123-3=0

We add all the numbers together, and all the variables

-10a+120=0

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

-10a=-120

a=-120/-10

a=+12

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