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Simplifying -5x + 2(6x + 2) = 81 Reorder the terms: -5x + 2(2 + 6x) = 81 -5x + (2 * 2 + 6x * 2) = 81 -5x + (4 + 12x) = 81 Reorder the terms: 4 + -5x + 12x = 81 Combine like terms: -5x + 12x = 7x 4 + 7x = 81 Solving 4 + 7x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 7x = 81 + -4 Combine like terms: 4 + -4 = 0 0 + 7x = 81 + -4 7x = 81 + -4 Combine like terms: 81 + -4 = 77 7x = 77 Divide each side by '7'. x = 11 Simplifying x = 11
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