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Simplifying -4 + -1(-16 + -7) = 20 + -1(-4 + 21) Combine like terms: -16 + -7 = -23 -4 + -1(-23) = 20 + -1(-4 + 21) Multiply -1 * -23 -4 + 23 = 20 + -1(-4 + 21) Combine like terms: -4 + 23 = 19 19 = 20 + -1(-4 + 21) Combine like terms: -4 + 21 = 17 19 = 20 + -1(17) Multiply -1 * 17 19 = 20 + -17 Combine like terms: 20 + -17 = 3 19 = 3 Solving 19 = 3 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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