42-72=-20-1

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Solution for 42-72=-20-1 equation:


42-72=-20-1

We simplify the equation to the form, which is simple to understand 
42-72=-20-1

We move all terms containing  to the left and all other terms to the right. 
0=-20-1-42+72

We simplify left and right side of the equation. 
0=+9

0=9

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

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