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Simplifying 4(x + 7) = 8x + 9 + -4x + 19 Reorder the terms: 4(7 + x) = 8x + 9 + -4x + 19 (7 * 4 + x * 4) = 8x + 9 + -4x + 19 (28 + 4x) = 8x + 9 + -4x + 19 Reorder the terms: 28 + 4x = 9 + 19 + 8x + -4x Combine like terms: 9 + 19 = 28 28 + 4x = 28 + 8x + -4x Combine like terms: 8x + -4x = 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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