21-x=85

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Solution for 21-x=85 equation:


21-x=85

We simplify the equation to the form, which is simple to understand 
21-x=85

We move all terms containing x to the left and all other terms to the right. 
-1x=+85-21

We simplify left and right side of the equation. 
-1x=+64

We divide both sides of the equation by -1 to get x. 
x=-64

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