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Simplifying 3x + 9 = -90 + -8x Reorder the terms: 9 + 3x = -90 + -8x Solving 9 + 3x = -90 + -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. 9 + 3x + 8x = -90 + -8x + 8x Combine like terms: 3x + 8x = 11x 9 + 11x = -90 + -8x + 8x Combine like terms: -8x + 8x = 0 9 + 11x = -90 + 0 9 + 11x = -90 Add '-9' to each side of the equation. 9 + -9 + 11x = -90 + -9 Combine like terms: 9 + -9 = 0 0 + 11x = -90 + -9 11x = -90 + -9 Combine like terms: -90 + -9 = -99 11x = -99 Divide each side by '11'. x = -9 Simplifying x = -9
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