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