3(9+x)=42

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Solution for 3(9+x)=42 equation: 



3(9+x)=42

We move all terms to the left:

3(9+x)-(42)=0

We add all the numbers together, and all the variables

3(x+9)-42=0

We multiply parentheses

3x+27-42=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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