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Simplifying 3 * 7 + -20 = 12 + -2 * 7 + 3 Multiply 3 * 7 21 + -20 = 12 + -2 * 7 + 3 Combine like terms: 21 + -20 = 1 1 = 12 + -2 * 7 + 3 Multiply -2 * 7 1 = 12 + -14 + 3 Combine like terms: 12 + -14 = -2 1 = -2 + 3 Combine like terms: -2 + 3 = 1 1 = 1 Add '-1' to each side of the equation. 1 + -1 = 1 + -1 Combine like terms: 1 + -1 = 0 0 = 1 + -1 Combine like terms: 1 + -1 = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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