3a+30=5a-12

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Solution for 3a+30=5a-12 equation: 



3a+30=5a-12

We move all terms to the left:

3a+30-(5a-12)=0

We get rid of parentheses

3a-5a+12+30=0

We add all the numbers together, and all the variables

-2a+42=0

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

-2a=-42

a=-42/-2

a=+21

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