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Simplifying -4(4x + -4) + 5 = -16x + 21 Reorder the terms: -4(-4 + 4x) + 5 = -16x + 21 (-4 * -4 + 4x * -4) + 5 = -16x + 21 (16 + -16x) + 5 = -16x + 21 Reorder the terms: 16 + 5 + -16x = -16x + 21 Combine like terms: 16 + 5 = 21 21 + -16x = -16x + 21 Reorder the terms: 21 + -16x = 21 + -16x Add '-21' to each side of the equation. 21 + -21 + -16x = 21 + -21 + -16x Combine like terms: 21 + -21 = 0 0 + -16x = 21 + -21 + -16x -16x = 21 + -21 + -16x Combine like terms: 21 + -21 = 0 -16x = 0 + -16x -16x = -16x Add '16x' to each side of the equation. -16x + 16x = -16x + 16x Combine like terms: -16x + 16x = 0 0 = -16x + 16x Combine like terms: -16x + 16x = 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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