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Simplifying -54 + 42 + -9 = 0 Combine like terms: -54 + 42 = -12 -12 + -9 = 0 Combine like terms: -12 + -9 = -21 -21 = 0 Solving -21 = 0 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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