(20+x)+(x+39)=90

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Solution for (20+x)+(x+39)=90 equation: 



(20+x)+(x+39)=90

We move all terms to the left:

(20+x)+(x+39)-(90)=0

We add all the numbers together, and all the variables

(x+20)+(x+39)-90=0

We get rid of parentheses

x+x+20+39-90=0

We add all the numbers together, and all the variables

2x-31=0

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

2x=31

x=31/2

x=15+1/2

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