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Simplifying -4(5x + -2) + 7 = -20x + 15 Reorder the terms: -4(-2 + 5x) + 7 = -20x + 15 (-2 * -4 + 5x * -4) + 7 = -20x + 15 (8 + -20x) + 7 = -20x + 15 Reorder the terms: 8 + 7 + -20x = -20x + 15 Combine like terms: 8 + 7 = 15 15 + -20x = -20x + 15 Reorder the terms: 15 + -20x = 15 + -20x Add '-15' to each side of the equation. 15 + -15 + -20x = 15 + -15 + -20x Combine like terms: 15 + -15 = 0 0 + -20x = 15 + -15 + -20x -20x = 15 + -15 + -20x Combine like terms: 15 + -15 = 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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