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Simplifying 3(x + 7) + 15 = (2x + 15) + (x + 21) Reorder the terms: 3(7 + x) + 15 = (2x + 15) + (x + 21) (7 * 3 + x * 3) + 15 = (2x + 15) + (x + 21) (21 + 3x) + 15 = (2x + 15) + (x + 21) Reorder the terms: 21 + 15 + 3x = (2x + 15) + (x + 21) Combine like terms: 21 + 15 = 36 36 + 3x = (2x + 15) + (x + 21) Reorder the terms: 36 + 3x = (15 + 2x) + (x + 21) Remove parenthesis around (15 + 2x) 36 + 3x = 15 + 2x + (x + 21) Reorder the terms: 36 + 3x = 15 + 2x + (21 + x) Remove parenthesis around (21 + x) 36 + 3x = 15 + 2x + 21 + x Reorder the terms: 36 + 3x = 15 + 21 + 2x + x Combine like terms: 15 + 21 = 36 36 + 3x = 36 + 2x + x Combine like terms: 2x + x = 3x 36 + 3x = 36 + 3x Add '-36' to each side of the equation. 36 + -36 + 3x = 36 + -36 + 3x Combine like terms: 36 + -36 = 0 0 + 3x = 36 + -36 + 3x 3x = 36 + -36 + 3x Combine like terms: 36 + -36 = 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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