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Simplifying 3(3x + 4) + 2(2x + 2) + 5 = 13x + 21 Reorder the terms: 3(4 + 3x) + 2(2x + 2) + 5 = 13x + 21 (4 * 3 + 3x * 3) + 2(2x + 2) + 5 = 13x + 21 (12 + 9x) + 2(2x + 2) + 5 = 13x + 21 Reorder the terms: 12 + 9x + 2(2 + 2x) + 5 = 13x + 21 12 + 9x + (2 * 2 + 2x * 2) + 5 = 13x + 21 12 + 9x + (4 + 4x) + 5 = 13x + 21 Reorder the terms: 12 + 4 + 5 + 9x + 4x = 13x + 21 Combine like terms: 12 + 4 = 16 16 + 5 + 9x + 4x = 13x + 21 Combine like terms: 16 + 5 = 21 21 + 9x + 4x = 13x + 21 Combine like terms: 9x + 4x = 13x 21 + 13x = 13x + 21 Reorder the terms: 21 + 13x = 21 + 13x Add '-21' to each side of the equation. 21 + -21 + 13x = 21 + -21 + 13x Combine like terms: 21 + -21 = 0 0 + 13x = 21 + -21 + 13x 13x = 21 + -21 + 13x Combine like terms: 21 + -21 = 0 13x = 0 + 13x 13x = 13x Add '-13x' to each side of the equation. 13x + -13x = 13x + -13x Combine like terms: 13x + -13x = 0 0 = 13x + -13x Combine like terms: 13x + -13x = 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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