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Simplifying -4 + 4x + 5x + 12 = 91 Reorder the terms: -4 + 12 + 4x + 5x = 91 Combine like terms: -4 + 12 = 8 8 + 4x + 5x = 91 Combine like terms: 4x + 5x = 9x 8 + 9x = 91 Solving 8 + 9x = 91 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 9x = 91 + -8 Combine like terms: 8 + -8 = 0 0 + 9x = 91 + -8 9x = 91 + -8 Combine like terms: 91 + -8 = 83 9x = 83 Divide each side by '9'. x = 9.222222222 Simplifying x = 9.222222222
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