2a-12=4a-78

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Solution for 2a-12=4a-78 equation: 



2a-12=4a-78

We move all terms to the left:

2a-12-(4a-78)=0

We get rid of parentheses

2a-4a+78-12=0

We add all the numbers together, and all the variables

-2a+66=0

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

-2a=-66

a=-66/-2

a=+33

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