(x-30)=90

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Solution for (x-30)=90 equation: 



(x-30)=90

We move all terms to the left:

(x-30)-(90)=0

We get rid of parentheses

x-30-90=0

We add all the numbers together, and all the variables

x-120=0

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

x=120

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