x+(x+7)+(x+14)=84

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Solution for x+(x+7)+(x+14)=84 equation: 



x+(x+7)+(x+14)=84

We move all terms to the left:

x+(x+7)+(x+14)-(84)=0

We get rid of parentheses

x+x+x+7+14-84=0

We add all the numbers together, and all the variables

3x-63=0

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

3x=63

x=63/3

x=21

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