(x+20)=(90-x)

Solution for (x+20)=(90-x) equation:

(x+20)=(90-x)

We move all terms to the left:

(x+20)-((90-x))=0

We add all the numbers together, and all the variables

(x+20)-((-1x+90))=0

We get rid of parentheses

x-((-1x+90))+20=0


We calculate terms in parentheses: -((-1x+90)), so:

(-1x+90)

We get rid of parentheses

-1x+90

Back to the equation:

-(-1x+90)


We get rid of parentheses

x+1x-90+20=0

We add all the numbers together, and all the variables

2x-70=0

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

2x=70

x=70/2

x=35