30=78-12x

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Solution for 30=78-12x equation: 



30=78-12x

We move all terms to the left:

30-(78-12x)=0

We add all the numbers together, and all the variables

-(-12x+78)+30=0

We get rid of parentheses

12x-78+30=0

We add all the numbers together, and all the variables

12x-48=0

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

12x=48

x=48/12

x=4

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