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Simplifying -5x + 8 + -4x2 + -4x + 2x2 = -2x2 + -9x + 8 Reorder the terms: 8 + -5x + -4x + -4x2 + 2x2 = -2x2 + -9x + 8 Combine like terms: -5x + -4x = -9x 8 + -9x + -4x2 + 2x2 = -2x2 + -9x + 8 Combine like terms: -4x2 + 2x2 = -2x2 8 + -9x + -2x2 = -2x2 + -9x + 8 Reorder the terms: 8 + -9x + -2x2 = 8 + -9x + -2x2 Add '-8' to each side of the equation. 8 + -9x + -8 + -2x2 = 8 + -9x + -8 + -2x2 Reorder the terms: 8 + -8 + -9x + -2x2 = 8 + -9x + -8 + -2x2 Combine like terms: 8 + -8 = 0 0 + -9x + -2x2 = 8 + -9x + -8 + -2x2 -9x + -2x2 = 8 + -9x + -8 + -2x2 Reorder the terms: -9x + -2x2 = 8 + -8 + -9x + -2x2 Combine like terms: 8 + -8 = 0 -9x + -2x2 = 0 + -9x + -2x2 -9x + -2x2 = -9x + -2x2 Add '9x' to each side of the equation. -9x + 9x + -2x2 = -9x + 9x + -2x2 Combine like terms: -9x + 9x = 0 0 + -2x2 = -9x + 9x + -2x2 -2x2 = -9x + 9x + -2x2 Combine like terms: -9x + 9x = 0 -2x2 = 0 + -2x2 -2x2 = -2x2 Add '2x2' to each side of the equation. -2x2 + 2x2 = -2x2 + 2x2 Combine like terms: -2x2 + 2x2 = 0 0 = -2x2 + 2x2 Combine like terms: -2x2 + 2x2 = 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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