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Simplifying -1(x + 1) = -4x + 20 Reorder the terms: -1(1 + x) = -4x + 20 (1 * -1 + x * -1) = -4x + 20 (-1 + -1x) = -4x + 20 Reorder the terms: -1 + -1x = 20 + -4x Solving -1 + -1x = 20 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. -1 + -1x + 4x = 20 + -4x + 4x Combine like terms: -1x + 4x = 3x -1 + 3x = 20 + -4x + 4x Combine like terms: -4x + 4x = 0 -1 + 3x = 20 + 0 -1 + 3x = 20 Add '1' to each side of the equation. -1 + 1 + 3x = 20 + 1 Combine like terms: -1 + 1 = 0 0 + 3x = 20 + 1 3x = 20 + 1 Combine like terms: 20 + 1 = 21 3x = 21 Divide each side by '3'. x = 7 Simplifying x = 7
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