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Simplifying -1(x + 3) = -5x + 21 Reorder the terms: -1(3 + x) = -5x + 21 (3 * -1 + x * -1) = -5x + 21 (-3 + -1x) = -5x + 21 Reorder the terms: -3 + -1x = 21 + -5x Solving -3 + -1x = 21 + -5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5x' to each side of the equation. -3 + -1x + 5x = 21 + -5x + 5x Combine like terms: -1x + 5x = 4x -3 + 4x = 21 + -5x + 5x Combine like terms: -5x + 5x = 0 -3 + 4x = 21 + 0 -3 + 4x = 21 Add '3' to each side of the equation. -3 + 3 + 4x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 4x = 21 + 3 4x = 21 + 3 Combine like terms: 21 + 3 = 24 4x = 24 Divide each side by '4'. x = 6 Simplifying x = 6
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