(90-x)-x=45

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Solution for (90-x)-x=45 equation: 



(90-x)-x=45

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

-2x+45=0

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

-2x=-45

x=-45/-2

x=22+1/2

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