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Simplifying -4(5x + -7) + 3 = -20x + 31 Reorder the terms: -4(-7 + 5x) + 3 = -20x + 31 (-7 * -4 + 5x * -4) + 3 = -20x + 31 (28 + -20x) + 3 = -20x + 31 Reorder the terms: 28 + 3 + -20x = -20x + 31 Combine like terms: 28 + 3 = 31 31 + -20x = -20x + 31 Reorder the terms: 31 + -20x = 31 + -20x Add '-31' to each side of the equation. 31 + -31 + -20x = 31 + -31 + -20x Combine like terms: 31 + -31 = 0 0 + -20x = 31 + -31 + -20x -20x = 31 + -31 + -20x Combine like terms: 31 + -31 = 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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