3(1-2)=21

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Solution for 3(1-2)=21 equation:


3(1-2)=21

We simplify the equation to the form, which is simple to understand 
3(1-2)=21

Reorder the terms in parentheses
+(-3)=21

Remove unnecessary parentheses
-3=+21

We move all terms containing  to the left and all other terms to the right. 
0=+21+3

We simplify left and right side of the equation. 
0=+24

0=24

The left and right sides are not equal, therefore there is no solution. This equation is invalid.

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