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Simplifying -4(x + 5) = -1(4x + 20) Reorder the terms: -4(5 + x) = -1(4x + 20) (5 * -4 + x * -4) = -1(4x + 20) (-20 + -4x) = -1(4x + 20) Reorder the terms: -20 + -4x = -1(20 + 4x) -20 + -4x = (20 * -1 + 4x * -1) -20 + -4x = (-20 + -4x) Add '20' to each side of the equation. -20 + 20 + -4x = -20 + 20 + -4x Combine like terms: -20 + 20 = 0 0 + -4x = -20 + 20 + -4x -4x = -20 + 20 + -4x Combine like terms: -20 + 20 = 0 -4x = 0 + -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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