x+21=18

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Solution for x+21=18 equation:


x+21=18

We simplify the equation to the form, which is simple to understand 
x+21=18

We move all terms containing x to the left and all other terms to the right. 
+1x=+18-21

We simplify left and right side of the equation. 
+1x=-3

We divide both sides of the equation by 1 to get x. 
x=-3

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