21+x=90

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Solution for 21+x=90 equation:


21+x=90

We simplify the equation to the form, which is simple to understand 
21+x=90

We move all terms containing x to the left and all other terms to the right. 
+1x=+90-21

We simplify left and right side of the equation. 
+1x=+69

We divide both sides of the equation by 1 to get x. 
x=69

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