21=-7(2-1)

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Solution for 21=-7(2-1) equation:


21=-7(2-1)

We simplify the equation to the form, which is simple to understand 
21=-7(2-1)

Reorder the terms in parentheses
21=+(-7)

Remove unnecessary parentheses
+21=-7

We move all terms containing  to the left and all other terms to the right. 
0=-7-21

We simplify left and right side of the equation. 
0=-28

0=-28

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

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