(40+x)+x=180

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Solution for (40+x)+x=180 equation: 



(40+x)+x=180

We move all terms to the left:

(40+x)+x-(180)=0

We add all the numbers together, and all the variables

(x+40)+x-180=0

We add all the numbers together, and all the variables

x+(x+40)-180=0

We get rid of parentheses

x+x+40-180=0

We add all the numbers together, and all the variables

2x-140=0

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

2x=140

x=140/2

x=70

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