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