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Simplifying 12(x + 7) = 4(21 + 3x) Reorder the terms: 12(7 + x) = 4(21 + 3x) (7 * 12 + x * 12) = 4(21 + 3x) (84 + 12x) = 4(21 + 3x) 84 + 12x = (21 * 4 + 3x * 4) 84 + 12x = (84 + 12x) Add '-84' to each side of the equation. 84 + -84 + 12x = 84 + -84 + 12x Combine like terms: 84 + -84 = 0 0 + 12x = 84 + -84 + 12x 12x = 84 + -84 + 12x Combine like terms: 84 + -84 = 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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