4x+21=30-3x

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Solution for 4x+21=30-3x equation: 



4x+21=30-3x

We move all terms to the left:

4x+21-(30-3x)=0

We add all the numbers together, and all the variables

4x-(-3x+30)+21=0

We get rid of parentheses

4x+3x-30+21=0

We add all the numbers together, and all the variables

7x-9=0

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

7x=9

x=9/7

x=1+2/7

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