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Simplifying 81 = -2x + -3(5x + 7) Reorder the terms: 81 = -2x + -3(7 + 5x) 81 = -2x + (7 * -3 + 5x * -3) 81 = -2x + (-21 + -15x) Reorder the terms: 81 = -21 + -2x + -15x Combine like terms: -2x + -15x = -17x 81 = -21 + -17x Solving 81 = -21 + -17x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '17x' to each side of the equation. 81 + 17x = -21 + -17x + 17x Combine like terms: -17x + 17x = 0 81 + 17x = -21 + 0 81 + 17x = -21 Add '-81' to each side of the equation. 81 + -81 + 17x = -21 + -81 Combine like terms: 81 + -81 = 0 0 + 17x = -21 + -81 17x = -21 + -81 Combine like terms: -21 + -81 = -102 17x = -102 Divide each side by '17'. x = -6 Simplifying x = -6
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