x+66=90-x

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Solution for x+66=90-x equation: 



x+66=90-x

We move all terms to the left:

x+66-(90-x)=0

We add all the numbers together, and all the variables

x-(-1x+90)+66=0

We get rid of parentheses

x+1x-90+66=0

We add all the numbers together, and all the variables

2x-24=0

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

2x=24

x=24/2

x=12

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