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Simplifying 40x + 80 = 2(20x + -2) + 84 Reorder the terms: 80 + 40x = 2(20x + -2) + 84 Reorder the terms: 80 + 40x = 2(-2 + 20x) + 84 80 + 40x = (-2 * 2 + 20x * 2) + 84 80 + 40x = (-4 + 40x) + 84 Reorder the terms: 80 + 40x = -4 + 84 + 40x Combine like terms: -4 + 84 = 80 80 + 40x = 80 + 40x Add '-80' to each side of the equation. 80 + -80 + 40x = 80 + -80 + 40x Combine like terms: 80 + -80 = 0 0 + 40x = 80 + -80 + 40x 40x = 80 + -80 + 40x Combine like terms: 80 + -80 = 0 40x = 0 + 40x 40x = 40x Add '-40x' to each side of the equation. 40x + -40x = 40x + -40x Combine like terms: 40x + -40x = 0 0 = 40x + -40x Combine like terms: 40x + -40x = 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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