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Simplifying -5(-4) + -1(-4 + 6) = 21 Multiply -5 * -4 20 + -1(-4 + 6) = 21 Combine like terms: -4 + 6 = 2 20 + -1(2) = 21 Multiply -1 * 2 20 + -2 = 21 Combine like terms: 20 + -2 = 18 18 = 21 Solving 18 = 21 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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