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