15+x=21

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Solution for 15+x=21 equation:


15+x=21

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

We move all terms containing x to the left and all other terms to the right. 
+1x=+21-15

We simplify left and right side of the equation. 
+1x=+6

We divide both sides of the equation by 1 to get x. 
x=6

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