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Simplifying x + 21 + 4x = -42 + -4x + -45 Reorder the terms: 21 + x + 4x = -42 + -4x + -45 Combine like terms: x + 4x = 5x 21 + 5x = -42 + -4x + -45 Reorder the terms: 21 + 5x = -42 + -45 + -4x Combine like terms: -42 + -45 = -87 21 + 5x = -87 + -4x Solving 21 + 5x = -87 + -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. 21 + 5x + 4x = -87 + -4x + 4x Combine like terms: 5x + 4x = 9x 21 + 9x = -87 + -4x + 4x Combine like terms: -4x + 4x = 0 21 + 9x = -87 + 0 21 + 9x = -87 Add '-21' to each side of the equation. 21 + -21 + 9x = -87 + -21 Combine like terms: 21 + -21 = 0 0 + 9x = -87 + -21 9x = -87 + -21 Combine like terms: -87 + -21 = -108 9x = -108 Divide each side by '9'. x = -12 Simplifying x = -12
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