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Simplifying 4 + -3x2 + -9x + -7 + x2 = -2x2 + -9x + -3 Reorder the terms: 4 + -7 + -9x + -3x2 + x2 = -2x2 + -9x + -3 Combine like terms: 4 + -7 = -3 -3 + -9x + -3x2 + x2 = -2x2 + -9x + -3 Combine like terms: -3x2 + x2 = -2x2 -3 + -9x + -2x2 = -2x2 + -9x + -3 Reorder the terms: -3 + -9x + -2x2 = -3 + -9x + -2x2 Add '3' to each side of the equation. -3 + -9x + 3 + -2x2 = -3 + -9x + 3 + -2x2 Reorder the terms: -3 + 3 + -9x + -2x2 = -3 + -9x + 3 + -2x2 Combine like terms: -3 + 3 = 0 0 + -9x + -2x2 = -3 + -9x + 3 + -2x2 -9x + -2x2 = -3 + -9x + 3 + -2x2 Reorder the terms: -9x + -2x2 = -3 + 3 + -9x + -2x2 Combine like terms: -3 + 3 = 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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