120-x=90,

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Solution for 120-x=90, equation: 



120-x=90.

We move all terms to the left:

120-x-(90.)=0

We add all the numbers together, and all the variables

-x+120-90=0

We add all the numbers together, and all the variables

-1x+30=0

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

-x=-30

x=-30/-1

x=+30

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