x+6=4x-21=30

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Solution for x+6=4x-21=30 equation: 



x+6=4x-21=30

We move all terms to the left:

x+6-(4x-21)=0

We get rid of parentheses

x-4x+21+6=0

We add all the numbers together, and all the variables

-3x+27=0

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

-3x=-27

x=-27/-3

x=+9

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