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Simplifying 72 + -1(12 + 9) = 0 Combine like terms: 12 + 9 = 21 72 + -1(21) = 0 Multiply -1 * 21 72 + -21 = 0 Combine like terms: 72 + -21 = 51 51 = 0 Solving 51 = 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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