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Simplifying -21 + -5x = -5(x + 4) Reorder the terms: -21 + -5x = -5(4 + x) -21 + -5x = (4 * -5 + x * -5) -21 + -5x = (-20 + -5x) Add '5x' to each side of the equation. -21 + -5x + 5x = -20 + -5x + 5x Combine like terms: -5x + 5x = 0 -21 + 0 = -20 + -5x + 5x -21 = -20 + -5x + 5x Combine like terms: -5x + 5x = 0 -21 = -20 + 0 -21 = -20 Solving -21 = -20 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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