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Simplifying 4x + 15 = 2(2x + 3) + 9 Reorder the terms: 15 + 4x = 2(2x + 3) + 9 Reorder the terms: 15 + 4x = 2(3 + 2x) + 9 15 + 4x = (3 * 2 + 2x * 2) + 9 15 + 4x = (6 + 4x) + 9 Reorder the terms: 15 + 4x = 6 + 9 + 4x Combine like terms: 6 + 9 = 15 15 + 4x = 15 + 4x Add '-15' to each side of the equation. 15 + -15 + 4x = 15 + -15 + 4x Combine like terms: 15 + -15 = 0 0 + 4x = 15 + -15 + 4x 4x = 15 + -15 + 4x Combine like terms: 15 + -15 = 0 4x = 0 + 4x 4x = 4x Add '-4x' to each side of the equation. 4x + -4x = 4x + -4x Combine like terms: 4x + -4x = 0 0 = 4x + -4x Combine like terms: 4x + -4x = 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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