x+2x+(x+4)=84

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Solution for x+2x+(x+4)=84 equation: 



x+2x+(x+4)=84

We move all terms to the left:

x+2x+(x+4)-(84)=0

We add all the numbers together, and all the variables

3x+(x+4)-84=0

We get rid of parentheses

3x+x+4-84=0

We add all the numbers together, and all the variables

4x-80=0

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

4x=80

x=80/4

x=20

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