120=11x+21

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Solution for 120=11x+21 equation: 



120=11x+21

We move all terms to the left:

120-(11x+21)=0

We get rid of parentheses

-11x-21+120=0

We add all the numbers together, and all the variables

-11x+99=0

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

-11x=-99

x=-99/-11

x=+9

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