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Simplifying 7x2 + 4x + 12 = 7x2 + 4x + 12 Reorder the terms: 12 + 4x + 7x2 = 7x2 + 4x + 12 Reorder the terms: 12 + 4x + 7x2 = 12 + 4x + 7x2 Add '-12' to each side of the equation. 12 + 4x + -12 + 7x2 = 12 + 4x + -12 + 7x2 Reorder the terms: 12 + -12 + 4x + 7x2 = 12 + 4x + -12 + 7x2 Combine like terms: 12 + -12 = 0 0 + 4x + 7x2 = 12 + 4x + -12 + 7x2 4x + 7x2 = 12 + 4x + -12 + 7x2 Reorder the terms: 4x + 7x2 = 12 + -12 + 4x + 7x2 Combine like terms: 12 + -12 = 0 4x + 7x2 = 0 + 4x + 7x2 4x + 7x2 = 4x + 7x2 Add '-4x' to each side of the equation. 4x + -4x + 7x2 = 4x + -4x + 7x2 Combine like terms: 4x + -4x = 0 0 + 7x2 = 4x + -4x + 7x2 7x2 = 4x + -4x + 7x2 Combine like terms: 4x + -4x = 0 7x2 = 0 + 7x2 7x2 = 7x2 Add '-7x2' to each side of the equation. 7x2 + -7x2 = 7x2 + -7x2 Combine like terms: 7x2 + -7x2 = 0 0 = 7x2 + -7x2 Combine like terms: 7x2 + -7x2 = 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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