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Simplifying -20 = -4(2x + -1) Reorder the terms: -20 = -4(-1 + 2x) -20 = (-1 * -4 + 2x * -4) -20 = (4 + -8x) Solving -20 = 4 + -8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8x' to each side of the equation. -20 + 8x = 4 + -8x + 8x Combine like terms: -8x + 8x = 0 -20 + 8x = 4 + 0 -20 + 8x = 4 Add '20' to each side of the equation. -20 + 20 + 8x = 4 + 20 Combine like terms: -20 + 20 = 0 0 + 8x = 4 + 20 8x = 4 + 20 Combine like terms: 4 + 20 = 24 8x = 24 Divide each side by '8'. x = 3 Simplifying x = 3
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