X+(50+x)=90

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Solution for X+(50+x)=90 equation: 



X+(50+X)=90

We move all terms to the left:

X+(50+X)-(90)=0

We add all the numbers together, and all the variables

X+(X+50)-90=0

We get rid of parentheses

X+X+50-90=0

We add all the numbers together, and all the variables

2X-40=0

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

2X=40

X=40/2

X=20

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