(X+10)+3x+x=90

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Solution for (X+10)+3x+x=90 equation: 



(X+10)+3X+X=90

We move all terms to the left:

(X+10)+3X+X-(90)=0

We add all the numbers together, and all the variables

4X+(X+10)-90=0

We get rid of parentheses

4X+X+10-90=0

We add all the numbers together, and all the variables

5X-80=0

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

5X=80

X=80/5

X=16

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