x+(x-8)+(2x-12)=100

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Solution for x+(x-8)+(2x-12)=100 equation: 



x+(x-8)+(2x-12)=100

We move all terms to the left:

x+(x-8)+(2x-12)-(100)=0

We get rid of parentheses

x+x+2x-8-12-100=0

We add all the numbers together, and all the variables

4x-120=0

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

4x=120

x=120/4

x=30

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