(15+x)+2x=90

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Solution for (15+x)+2x=90 equation: 



(15+x)+2x=90

We move all terms to the left:

(15+x)+2x-(90)=0

We add all the numbers together, and all the variables

(x+15)+2x-90=0

We add all the numbers together, and all the variables

2x+(x+15)-90=0

We get rid of parentheses

2x+x+15-90=0

We add all the numbers together, and all the variables

3x-75=0

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

3x=75

x=75/3

x=25

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