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Simplifying x + 21 + 3x = -9 + -3x + -12 Reorder the terms: 21 + x + 3x = -9 + -3x + -12 Combine like terms: x + 3x = 4x 21 + 4x = -9 + -3x + -12 Reorder the terms: 21 + 4x = -9 + -12 + -3x Combine like terms: -9 + -12 = -21 21 + 4x = -21 + -3x Solving 21 + 4x = -21 + -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 + 4x + 3x = -21 + -3x + 3x Combine like terms: 4x + 3x = 7x 21 + 7x = -21 + -3x + 3x Combine like terms: -3x + 3x = 0 21 + 7x = -21 + 0 21 + 7x = -21 Add '-21' to each side of the equation. 21 + -21 + 7x = -21 + -21 Combine like terms: 21 + -21 = 0 0 + 7x = -21 + -21 7x = -21 + -21 Combine like terms: -21 + -21 = -42 7x = -42 Divide each side by '7'. x = -6 Simplifying x = -6
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