X+(x-20)=84

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Solution for X+(x-20)=84 equation: 



X+(X-20)=84

We move all terms to the left:

X+(X-20)-(84)=0

We get rid of parentheses

X+X-20-84=0

We add all the numbers together, and all the variables

2X-104=0

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

2X=104

X=104/2

X=52

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