90=-x+300

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Solution for 90=-x+300 equation: 



90=-x+300

We move all terms to the left:

90-(-x+300)=0

We add all the numbers together, and all the variables

-(-1x+300)+90=0

We get rid of parentheses

1x-300+90=0

We add all the numbers together, and all the variables

x-210=0

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

x=210

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