18=x+(-21)

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Solution for 18=x+(-21) equation:


18=x+(-21)

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

Remove unnecessary parentheses
+18=+x-21

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

We simplify left and right side of the equation. 
-1x=-39

We divide both sides of the equation by -01 to get x. 
x=39

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