x+3x+(x+3)=72

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Solution for x+3x+(x+3)=72 equation: 



x+3x+(x+3)=72

We move all terms to the left:

x+3x+(x+3)-(72)=0

We add all the numbers together, and all the variables

4x+(x+3)-72=0

We get rid of parentheses

4x+x+3-72=0

We add all the numbers together, and all the variables

5x-69=0

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

5x=69

x=69/5

x=13+4/5

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