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Simplifying 45 + -1(-21) = 0 Multiply -1 * -21 45 + 21 = 0 Combine like terms: 45 + 21 = 66 66 = 0 Solving 66 = 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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