90=45-x

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Solution for 90=45-x equation: 



90=45-x

We move all terms to the left:

90-(45-x)=0

We add all the numbers together, and all the variables

-(-1x+45)+90=0

We get rid of parentheses

1x-45+90=0

We add all the numbers together, and all the variables

x+45=0

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

x=-45

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