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Simplifying -81 + 12x = 171 + -9x Solving -81 + 12x = 171 + -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 + 12x + 9x = 171 + -9x + 9x Combine like terms: 12x + 9x = 21x -81 + 21x = 171 + -9x + 9x Combine like terms: -9x + 9x = 0 -81 + 21x = 171 + 0 -81 + 21x = 171 Add '81' to each side of the equation. -81 + 81 + 21x = 171 + 81 Combine like terms: -81 + 81 = 0 0 + 21x = 171 + 81 21x = 171 + 81 Combine like terms: 171 + 81 = 252 21x = 252 Divide each side by '21'. x = 12 Simplifying x = 12
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