21+x=-18

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Solution for 21+x=-18 equation:


21+x=-18

We simplify the equation to the form, which is simple to understand 
21+x=-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=-39

We divide both sides of the equation by 1 to get x. 
x=-39

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