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Simplifying 4(x + 7) + -9 = 4x + 19 Reorder the terms: 4(7 + x) + -9 = 4x + 19 (7 * 4 + x * 4) + -9 = 4x + 19 (28 + 4x) + -9 = 4x + 19 Reorder the terms: 28 + -9 + 4x = 4x + 19 Combine like terms: 28 + -9 = 19 19 + 4x = 4x + 19 Reorder the terms: 19 + 4x = 19 + 4x Add '-19' to each side of the equation. 19 + -19 + 4x = 19 + -19 + 4x Combine like terms: 19 + -19 = 0 0 + 4x = 19 + -19 + 4x 4x = 19 + -19 + 4x Combine like terms: 19 + -19 = 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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