(x-21)=90

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Solution for (x-21)=90 equation: 



(x-21)=90

We move all terms to the left:

(x-21)-(90)=0

We get rid of parentheses

x-21-90=0

We add all the numbers together, and all the variables

x-111=0

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

x=111

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