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