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Simplifying 3x + 5(4x + -16) = 81 Reorder the terms: 3x + 5(-16 + 4x) = 81 3x + (-16 * 5 + 4x * 5) = 81 3x + (-80 + 20x) = 81 Reorder the terms: -80 + 3x + 20x = 81 Combine like terms: 3x + 20x = 23x -80 + 23x = 81 Solving -80 + 23x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '80' to each side of the equation. -80 + 80 + 23x = 81 + 80 Combine like terms: -80 + 80 = 0 0 + 23x = 81 + 80 23x = 81 + 80 Combine like terms: 81 + 80 = 161 23x = 161 Divide each side by '23'. x = 7 Simplifying x = 7
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