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Simplifying 19 + (-18) + -1(-20) + -7 + (-9) = 0 19 + -18 + -1(-20) + -7 + (-9) = 0 Multiply -1 * -20 19 + -18 + 20 + -7 + (-9) = 0 19 + -18 + 20 + -7 + -9 = 0 Combine like terms: 19 + -18 = 1 1 + 20 + -7 + -9 = 0 Combine like terms: 1 + 20 = 21 21 + -7 + -9 = 0 Combine like terms: 21 + -7 = 14 14 + -9 = 0 Combine like terms: 14 + -9 = 5 5 = 0 Solving 5 = 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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