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Simplifying -1(x + 4) = -20 Reorder the terms: -1(4 + x) = -20 (4 * -1 + x * -1) = -20 (-4 + -1x) = -20 Solving -4 + -1x = -20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -1x = -20 + 4 Combine like terms: -4 + 4 = 0 0 + -1x = -20 + 4 -1x = -20 + 4 Combine like terms: -20 + 4 = -16 -1x = -16 Divide each side by '-1'. x = 16 Simplifying x = 16
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