-90=6a-12

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Solution for -90=6a-12 equation: 



-90=6a-12

We move all terms to the left:

-90-(6a-12)=0

We get rid of parentheses

-6a+12-90=0

We add all the numbers together, and all the variables

-6a-78=0

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

-6a=78

a=78/-6

a=-13

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