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Simplifying 4 + -1(-21) = 0 Multiply -1 * -21 4 + 21 = 0 Combine like terms: 4 + 21 = 25 25 = 0 Solving 25 = 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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