2x+12=90-x

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Solution for 2x+12=90-x equation: 



2x+12=90-x

We move all terms to the left:

2x+12-(90-x)=0

We add all the numbers together, and all the variables

2x-(-1x+90)+12=0

We get rid of parentheses

2x+1x-90+12=0

We add all the numbers together, and all the variables

3x-78=0

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

3x=78

x=78/3

x=26

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