X+(x+3)=105

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Solution for X+(x+3)=105 equation: 



X+(X+3)=105

We move all terms to the left:

X+(X+3)-(105)=0

We get rid of parentheses

X+X+3-105=0

We add all the numbers together, and all the variables

2X-102=0

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

2X=102

X=102/2

X=51

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