7x+21=42-6+4x

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Solution for 7x+21=42-6+4x equation: 



7x+21=42-6+4x

We move all terms to the left:

7x+21-(42-6+4x)=0

We add all the numbers together, and all the variables

7x-(4x+36)+21=0

We get rid of parentheses

7x-4x-36+21=0

We add all the numbers together, and all the variables

3x-15=0

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

3x=15

x=15/3

x=5

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