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Simplifying 20 + 30 * 0 + 1 = 21 Multiply 30 * 0 20 + 0 + 1 = 21 Anything times zero is zero. 20 + 0 + 1 = 21 Combine like terms: 20 + 0 = 20 20 + 1 = 21 Combine like terms: 20 + 1 = 21 21 = 21 Add '-21' to each side of the equation. 21 + -21 = 21 + -21 Combine like terms: 21 + -21 = 0 0 = 21 + -21 Combine like terms: 21 + -21 = 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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