x+2x-57=90-x

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Solution for x+2x-57=90-x equation: 



x+2x-57=90-x

We move all terms to the left:

x+2x-57-(90-x)=0

We add all the numbers together, and all the variables

x+2x-(-1x+90)-57=0

We add all the numbers together, and all the variables

3x-(-1x+90)-57=0

We get rid of parentheses

3x+1x-90-57=0

We add all the numbers together, and all the variables

4x-147=0

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

4x=147

x=147/4

x=36+3/4

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