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Simplifying 5(4x + -4) + -1 = 20x + -21 Reorder the terms: 5(-4 + 4x) + -1 = 20x + -21 (-4 * 5 + 4x * 5) + -1 = 20x + -21 (-20 + 20x) + -1 = 20x + -21 Reorder the terms: -20 + -1 + 20x = 20x + -21 Combine like terms: -20 + -1 = -21 -21 + 20x = 20x + -21 Reorder the terms: -21 + 20x = -21 + 20x Add '21' to each side of the equation. -21 + 21 + 20x = -21 + 21 + 20x Combine like terms: -21 + 21 = 0 0 + 20x = -21 + 21 + 20x 20x = -21 + 21 + 20x Combine like terms: -21 + 21 = 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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