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