100+(x+12)+x=180

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Solution for 100+(x+12)+x=180 equation: 



100+(x+12)+x=180

We move all terms to the left:

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

We add all the numbers together, and all the variables

x+(x+12)-80=0

We get rid of parentheses

x+x+12-80=0

We add all the numbers together, and all the variables

2x-68=0

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

2x=68

x=68/2

x=34

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