7*3=21

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Solution for 7*3=21 equation:


7*3=21

We simplify the equation to the form, which is simple to understand 
7*3=21

We move all terms containing  to the left and all other terms to the right. 
0=+21-21

We simplify left and right side of the equation. 
0=0

0=0

This equation is an identity, so all real numbers are solutions.

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