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Simplifying -81 + -9 = 8x + 21 Combine like terms: -81 + -9 = -90 -90 = 8x + 21 Reorder the terms: -90 = 21 + 8x Solving -90 = 21 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. -90 + -8x = 21 + 8x + -8x Combine like terms: 8x + -8x = 0 -90 + -8x = 21 + 0 -90 + -8x = 21 Add '90' to each side of the equation. -90 + 90 + -8x = 21 + 90 Combine like terms: -90 + 90 = 0 0 + -8x = 21 + 90 -8x = 21 + 90 Combine like terms: 21 + 90 = 111 -8x = 111 Divide each side by '-8'. x = -13.875 Simplifying x = -13.875
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