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Simplifying (15 + 5) + -1(20 * 3) + 7 = 0 Combine like terms: 15 + 5 = 20 (20) + -1(20 * 3) + 7 = 0 20 + -1(20 * 3) + 7 = 0 Multiply 20 * 3 20 + -1(60) + 7 = 0 Multiply -1 * 60 20 + -60 + 7 = 0 Combine like terms: 20 + -60 = -40 -40 + 7 = 0 Combine like terms: -40 + 7 = -33 -33 = 0 Solving -33 = 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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