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Simplifying -81 + -8 = 9x + 21 Combine like terms: -81 + -8 = -89 -89 = 9x + 21 Reorder the terms: -89 = 21 + 9x Solving -89 = 21 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. -89 + -9x = 21 + 9x + -9x Combine like terms: 9x + -9x = 0 -89 + -9x = 21 + 0 -89 + -9x = 21 Add '89' to each side of the equation. -89 + 89 + -9x = 21 + 89 Combine like terms: -89 + 89 = 0 0 + -9x = 21 + 89 -9x = 21 + 89 Combine like terms: 21 + 89 = 110 -9x = 110 Divide each side by '-9'. x = -12.22222222 Simplifying x = -12.22222222
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