3x-12=100-x

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Solution for 3x-12=100-x equation: 



3x-12=100-x

We move all terms to the left:

3x-12-(100-x)=0

We add all the numbers together, and all the variables

3x-(-1x+100)-12=0

We get rid of parentheses

3x+1x-100-12=0

We add all the numbers together, and all the variables

4x-112=0

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

4x=112

x=112/4

x=28

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