(12+3x)=42

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Solution for (12+3x)=42 equation: 



(12+3x)=42

We move all terms to the left:

(12+3x)-(42)=0

We add all the numbers together, and all the variables

(3x+12)-42=0

We get rid of parentheses

3x+12-42=0

We add all the numbers together, and all the variables

3x-30=0

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

3x=30

x=30/3

x=10

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