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Simplifying 12x + 21 = 3(4x + 7) Reorder the terms: 21 + 12x = 3(4x + 7) Reorder the terms: 21 + 12x = 3(7 + 4x) 21 + 12x = (7 * 3 + 4x * 3) 21 + 12x = (21 + 12x) Add '-21' to each side of the equation. 21 + -21 + 12x = 21 + -21 + 12x Combine like terms: 21 + -21 = 0 0 + 12x = 21 + -21 + 12x 12x = 21 + -21 + 12x Combine like terms: 21 + -21 = 0 12x = 0 + 12x 12x = 12x Add '-12x' to each side of the equation. 12x + -12x = 12x + -12x Combine like terms: 12x + -12x = 0 0 = 12x + -12x Combine like terms: 12x + -12x = 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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