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Simplifying 9 + -1(20) = 0 Multiply -1 * 20 9 + -20 = 0 Combine like terms: 9 + -20 = -11 -11 = 0 Solving -11 = 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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