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Simplifying 5(x + 4) = 9x + 5 + -4x + 15 Reorder the terms: 5(4 + x) = 9x + 5 + -4x + 15 (4 * 5 + x * 5) = 9x + 5 + -4x + 15 (20 + 5x) = 9x + 5 + -4x + 15 Reorder the terms: 20 + 5x = 5 + 15 + 9x + -4x Combine like terms: 5 + 15 = 20 20 + 5x = 20 + 9x + -4x Combine like terms: 9x + -4x = 5x 20 + 5x = 20 + 5x Add '-20' to each side of the equation. 20 + -20 + 5x = 20 + -20 + 5x Combine like terms: 20 + -20 = 0 0 + 5x = 20 + -20 + 5x 5x = 20 + -20 + 5x Combine like terms: 20 + -20 = 0 5x = 0 + 5x 5x = 5x Add '-5x' to each side of the equation. 5x + -5x = 5x + -5x Combine like terms: 5x + -5x = 0 0 = 5x + -5x Combine like terms: 5x + -5x = 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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