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4 2-69-54=0
We simplify the equation to the form, which is simple to understand
42-69-54=0
We move all terms containing to the left and all other terms to the right.
0=0-42+69+54
We simplify left and right side of the equation.
0=+81
0=81
The left and right sides are not equal, therefore there is no solution. This equation is invalid.