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Simplifying -128 = -4(5x + 7) Reorder the terms: -128 = -4(7 + 5x) -128 = (7 * -4 + 5x * -4) -128 = (-28 + -20x) Solving -128 = -28 + -20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20x' to each side of the equation. -128 + 20x = -28 + -20x + 20x Combine like terms: -20x + 20x = 0 -128 + 20x = -28 + 0 -128 + 20x = -28 Add '128' to each side of the equation. -128 + 128 + 20x = -28 + 128 Combine like terms: -128 + 128 = 0 0 + 20x = -28 + 128 20x = -28 + 128 Combine like terms: -28 + 128 = 100 20x = 100 Divide each side by '20'. x = 5 Simplifying x = 5
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