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Simplifying -9x + -21 = -21 + -20x + -87 Reorder the terms: -21 + -9x = -21 + -20x + -87 Reorder the terms: -21 + -9x = -21 + -87 + -20x Combine like terms: -21 + -87 = -108 -21 + -9x = -108 + -20x Solving -21 + -9x = -108 + -20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20x' to each side of the equation. -21 + -9x + 20x = -108 + -20x + 20x Combine like terms: -9x + 20x = 11x -21 + 11x = -108 + -20x + 20x Combine like terms: -20x + 20x = 0 -21 + 11x = -108 + 0 -21 + 11x = -108 Add '21' to each side of the equation. -21 + 21 + 11x = -108 + 21 Combine like terms: -21 + 21 = 0 0 + 11x = -108 + 21 11x = -108 + 21 Combine like terms: -108 + 21 = -87 11x = -87 Divide each side by '11'. x = -7.909090909 Simplifying x = -7.909090909
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