(x+12)+(x)+90=180

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Solution for (x+12)+(x)+90=180 equation: 



(x+12)+(x)+90=180

We move all terms to the left:

(x+12)+(x)+90-(180)=0

We add all the numbers together, and all the variables

x+(x+12)-90=0

We get rid of parentheses

x+x+12-90=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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