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Simplifying 12 = x + 81 Reorder the terms: 12 = 81 + x Solving 12 = 81 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 12 + -1x = 81 + x + -1x Combine like terms: x + -1x = 0 12 + -1x = 81 + 0 12 + -1x = 81 Add '-12' to each side of the equation. 12 + -12 + -1x = 81 + -12 Combine like terms: 12 + -12 = 0 0 + -1x = 81 + -12 -1x = 81 + -12 Combine like terms: 81 + -12 = 69 -1x = 69 Divide each side by '-1'. x = -69 Simplifying x = -69
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