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Simplifying -81 = 6x + 7x + -16 Reorder the terms: -81 = -16 + 6x + 7x Combine like terms: 6x + 7x = 13x -81 = -16 + 13x Solving -81 = -16 + 13x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13x' to each side of the equation. -81 + -13x = -16 + 13x + -13x Combine like terms: 13x + -13x = 0 -81 + -13x = -16 + 0 -81 + -13x = -16 Add '81' to each side of the equation. -81 + 81 + -13x = -16 + 81 Combine like terms: -81 + 81 = 0 0 + -13x = -16 + 81 -13x = -16 + 81 Combine like terms: -16 + 81 = 65 -13x = 65 Divide each side by '-13'. x = -5 Simplifying x = -5
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