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Simplifying 7x + 9 = -1x + 81 Reorder the terms: 9 + 7x = -1x + 81 Reorder the terms: 9 + 7x = 81 + -1x Solving 9 + 7x = 81 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 9 + 7x + x = 81 + -1x + x Combine like terms: 7x + x = 8x 9 + 8x = 81 + -1x + x Combine like terms: -1x + x = 0 9 + 8x = 81 + 0 9 + 8x = 81 Add '-9' to each side of the equation. 9 + -9 + 8x = 81 + -9 Combine like terms: 9 + -9 = 0 0 + 8x = 81 + -9 8x = 81 + -9 Combine like terms: 81 + -9 = 72 8x = 72 Divide each side by '8'. x = 9 Simplifying x = 9
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