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Simplifying -1(x + 3) = 4x + 21 Reorder the terms: -1(3 + x) = 4x + 21 (3 * -1 + x * -1) = 4x + 21 (-3 + -1x) = 4x + 21 Reorder the terms: -3 + -1x = 21 + 4x Solving -3 + -1x = 21 + 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. -3 + -1x + -4x = 21 + 4x + -4x Combine like terms: -1x + -4x = -5x -3 + -5x = 21 + 4x + -4x Combine like terms: 4x + -4x = 0 -3 + -5x = 21 + 0 -3 + -5x = 21 Add '3' to each side of the equation. -3 + 3 + -5x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + -5x = 21 + 3 -5x = 21 + 3 Combine like terms: 21 + 3 = 24 -5x = 24 Divide each side by '-5'. x = -4.8 Simplifying x = -4.8
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