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