(x+10)+2+x=90

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Solution for (x+10)+2+x=90 equation: 



(x+10)+2+x=90

We move all terms to the left:

(x+10)+2+x-(90)=0

We add all the numbers together, and all the variables

x+(x+10)-88=0

We get rid of parentheses

x+x+10-88=0

We add all the numbers together, and all the variables

2x-78=0

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

2x=78

x=78/2

x=39

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