12=90-6*x

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Solution for 12=90-6*x equation: 



12=90-6x

We move all terms to the left:

12-(90-6x)=0

We add all the numbers together, and all the variables

-(-6x+90)+12=0

We get rid of parentheses

6x-90+12=0

We add all the numbers together, and all the variables

6x-78=0

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

6x=78

x=78/6

x=13

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