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Simplifying 81 + -6x = 9x + 21 Reorder the terms: 81 + -6x = 21 + 9x Solving 81 + -6x = 21 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 81 + -6x + -9x = 21 + 9x + -9x Combine like terms: -6x + -9x = -15x 81 + -15x = 21 + 9x + -9x Combine like terms: 9x + -9x = 0 81 + -15x = 21 + 0 81 + -15x = 21 Add '-81' to each side of the equation. 81 + -81 + -15x = 21 + -81 Combine like terms: 81 + -81 = 0 0 + -15x = 21 + -81 -15x = 21 + -81 Combine like terms: 21 + -81 = -60 -15x = -60 Divide each side by '-15'. x = 4 Simplifying x = 4
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