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Simplifying 7(3x + 4) + 5 = 21x + 33 Reorder the terms: 7(4 + 3x) + 5 = 21x + 33 (4 * 7 + 3x * 7) + 5 = 21x + 33 (28 + 21x) + 5 = 21x + 33 Reorder the terms: 28 + 5 + 21x = 21x + 33 Combine like terms: 28 + 5 = 33 33 + 21x = 21x + 33 Reorder the terms: 33 + 21x = 33 + 21x Add '-33' to each side of the equation. 33 + -33 + 21x = 33 + -33 + 21x Combine like terms: 33 + -33 = 0 0 + 21x = 33 + -33 + 21x 21x = 33 + -33 + 21x Combine like terms: 33 + -33 = 0 21x = 0 + 21x 21x = 21x Add '-21x' to each side of the equation. 21x + -21x = 21x + -21x Combine like terms: 21x + -21x = 0 0 = 21x + -21x Combine like terms: 21x + -21x = 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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