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Simplifying 4(x + 7) = 9x + 8 + -5x + 20 Reorder the terms: 4(7 + x) = 9x + 8 + -5x + 20 (7 * 4 + x * 4) = 9x + 8 + -5x + 20 (28 + 4x) = 9x + 8 + -5x + 20 Reorder the terms: 28 + 4x = 8 + 20 + 9x + -5x Combine like terms: 8 + 20 = 28 28 + 4x = 28 + 9x + -5x Combine like terms: 9x + -5x = 4x 28 + 4x = 28 + 4x Add '-28' to each side of the equation. 28 + -28 + 4x = 28 + -28 + 4x Combine like terms: 28 + -28 = 0 0 + 4x = 28 + -28 + 4x 4x = 28 + -28 + 4x Combine like terms: 28 + -28 = 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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