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Simplifying (5x + -2) + (7x + 5) = -81 Reorder the terms: (-2 + 5x) + (7x + 5) = -81 Remove parenthesis around (-2 + 5x) -2 + 5x + (7x + 5) = -81 Reorder the terms: -2 + 5x + (5 + 7x) = -81 Remove parenthesis around (5 + 7x) -2 + 5x + 5 + 7x = -81 Reorder the terms: -2 + 5 + 5x + 7x = -81 Combine like terms: -2 + 5 = 3 3 + 5x + 7x = -81 Combine like terms: 5x + 7x = 12x 3 + 12x = -81 Solving 3 + 12x = -81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 12x = -81 + -3 Combine like terms: 3 + -3 = 0 0 + 12x = -81 + -3 12x = -81 + -3 Combine like terms: -81 + -3 = -84 12x = -84 Divide each side by '12'. x = -7 Simplifying x = -7
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