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Simplifying 21x + -16 + -13x = 4(2x + -5) + 4 Reorder the terms: -16 + 21x + -13x = 4(2x + -5) + 4 Combine like terms: 21x + -13x = 8x -16 + 8x = 4(2x + -5) + 4 Reorder the terms: -16 + 8x = 4(-5 + 2x) + 4 -16 + 8x = (-5 * 4 + 2x * 4) + 4 -16 + 8x = (-20 + 8x) + 4 Reorder the terms: -16 + 8x = -20 + 4 + 8x Combine like terms: -20 + 4 = -16 -16 + 8x = -16 + 8x Add '16' to each side of the equation. -16 + 16 + 8x = -16 + 16 + 8x Combine like terms: -16 + 16 = 0 0 + 8x = -16 + 16 + 8x 8x = -16 + 16 + 8x Combine like terms: -16 + 16 = 0 8x = 0 + 8x 8x = 8x Add '-8x' to each side of the equation. 8x + -8x = 8x + -8x Combine like terms: 8x + -8x = 0 0 = 8x + -8x Combine like terms: 8x + -8x = 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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