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Simplifying x2 + 3x = x(x + 3) Reorder the terms: 3x + x2 = x(x + 3) Reorder the terms: 3x + x2 = x(3 + x) 3x + x2 = (3 * x + x * x) 3x + x2 = (3x + x2) Add '-3x' to each side of the equation. 3x + -3x + x2 = 3x + -3x + x2 Combine like terms: 3x + -3x = 0 0 + x2 = 3x + -3x + x2 x2 = 3x + -3x + x2 Combine like terms: 3x + -3x = 0 x2 = 0 + x2 x2 = x2 Add '-1x2' to each side of the equation. x2 + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 0 = x2 + -1x2 Combine like terms: x2 + -1x2 = 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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