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Simplifying 3x2 + 5x + -4 = 2x2 + 7x + x2 + -2x + -4 Reorder the terms: -4 + 5x + 3x2 = 2x2 + 7x + x2 + -2x + -4 Reorder the terms: -4 + 5x + 3x2 = -4 + 7x + -2x + 2x2 + x2 Combine like terms: 7x + -2x = 5x -4 + 5x + 3x2 = -4 + 5x + 2x2 + x2 Combine like terms: 2x2 + x2 = 3x2 -4 + 5x + 3x2 = -4 + 5x + 3x2 Add '4' to each side of the equation. -4 + 5x + 4 + 3x2 = -4 + 5x + 4 + 3x2 Reorder the terms: -4 + 4 + 5x + 3x2 = -4 + 5x + 4 + 3x2 Combine like terms: -4 + 4 = 0 0 + 5x + 3x2 = -4 + 5x + 4 + 3x2 5x + 3x2 = -4 + 5x + 4 + 3x2 Reorder the terms: 5x + 3x2 = -4 + 4 + 5x + 3x2 Combine like terms: -4 + 4 = 0 5x + 3x2 = 0 + 5x + 3x2 5x + 3x2 = 5x + 3x2 Add '-5x' to each side of the equation. 5x + -5x + 3x2 = 5x + -5x + 3x2 Combine like terms: 5x + -5x = 0 0 + 3x2 = 5x + -5x + 3x2 3x2 = 5x + -5x + 3x2 Combine like terms: 5x + -5x = 0 3x2 = 0 + 3x2 3x2 = 3x2 Add '-3x2' to each side of the equation. 3x2 + -3x2 = 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 0 0 = 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 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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