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Simplifying 4(5x + -10) = 20(x + -20) Reorder the terms: 4(-10 + 5x) = 20(x + -20) (-10 * 4 + 5x * 4) = 20(x + -20) (-40 + 20x) = 20(x + -20) Reorder the terms: -40 + 20x = 20(-20 + x) -40 + 20x = (-20 * 20 + x * 20) -40 + 20x = (-400 + 20x) Add '-20x' to each side of the equation. -40 + 20x + -20x = -400 + 20x + -20x Combine like terms: 20x + -20x = 0 -40 + 0 = -400 + 20x + -20x -40 = -400 + 20x + -20x Combine like terms: 20x + -20x = 0 -40 = -400 + 0 -40 = -400 Solving -40 = -400 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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