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Simplifying 8x + -9 = 12 + x Reorder the terms: -9 + 8x = 12 + x Solving -9 + 8x = 12 + 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. -9 + 8x + -1x = 12 + x + -1x Combine like terms: 8x + -1x = 7x -9 + 7x = 12 + x + -1x Combine like terms: x + -1x = 0 -9 + 7x = 12 + 0 -9 + 7x = 12 Add '9' to each side of the equation. -9 + 9 + 7x = 12 + 9 Combine like terms: -9 + 9 = 0 0 + 7x = 12 + 9 7x = 12 + 9 Combine like terms: 12 + 9 = 21 7x = 21 Divide each side by '7'. x = 3 Simplifying x = 3
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