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Simplifying 13x + -21 = 4(2x + -4) + 5x + -5 Reorder the terms: -21 + 13x = 4(2x + -4) + 5x + -5 Reorder the terms: -21 + 13x = 4(-4 + 2x) + 5x + -5 -21 + 13x = (-4 * 4 + 2x * 4) + 5x + -5 -21 + 13x = (-16 + 8x) + 5x + -5 Reorder the terms: -21 + 13x = -16 + -5 + 8x + 5x Combine like terms: -16 + -5 = -21 -21 + 13x = -21 + 8x + 5x Combine like terms: 8x + 5x = 13x -21 + 13x = -21 + 13x Add '21' to each side of the equation. -21 + 21 + 13x = -21 + 21 + 13x Combine like terms: -21 + 21 = 0 0 + 13x = -21 + 21 + 13x 13x = -21 + 21 + 13x Combine like terms: -21 + 21 = 0 13x = 0 + 13x 13x = 13x Add '-13x' to each side of the equation. 13x + -13x = 13x + -13x Combine like terms: 13x + -13x = 0 0 = 13x + -13x Combine like terms: 13x + -13x = 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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