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Simplifying 7(3x + 8) + 8 = 21x + 64 Reorder the terms: 7(8 + 3x) + 8 = 21x + 64 (8 * 7 + 3x * 7) + 8 = 21x + 64 (56 + 21x) + 8 = 21x + 64 Reorder the terms: 56 + 8 + 21x = 21x + 64 Combine like terms: 56 + 8 = 64 64 + 21x = 21x + 64 Reorder the terms: 64 + 21x = 64 + 21x Add '-64' to each side of the equation. 64 + -64 + 21x = 64 + -64 + 21x Combine like terms: 64 + -64 = 0 0 + 21x = 64 + -64 + 21x 21x = 64 + -64 + 21x Combine like terms: 64 + -64 = 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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