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Simplifying 0 = 15 + -1(18) Multiply -1 * 18 0 = 15 + -18 Combine like terms: 15 + -18 = -3 0 = -3 Solving 0 = -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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