X=(90-x)-28

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Solution for X=(90-x)-28 equation: 



X=(90-X)-28

We move all terms to the left:

X-((90-X)-28)=0

We add all the numbers together, and all the variables

X-((-1X+90)-28)=0



We calculate terms in parentheses: -((-1X+90)-28), so:

(-1X+90)-28

We get rid of parentheses

-1X+90-28

We add all the numbers together, and all the variables

-1X+62

Back to the equation:

-(-1X+62)



We get rid of parentheses

X+1X-62=0

We add all the numbers together, and all the variables

2X-62=0

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

2X=62

X=62/2

X=31

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