x+54=90-x

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Solution for x+54=90-x equation: 



x+54=90-x

We move all terms to the left:

x+54-(90-x)=0

We add all the numbers together, and all the variables

x-(-1x+90)+54=0

We get rid of parentheses

x+1x-90+54=0

We add all the numbers together, and all the variables

2x-36=0

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

2x=36

x=36/2

x=18

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