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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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