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Simplifying 9x + -9 = 1x + 21 Reorder the terms: -9 + 9x = 1x + 21 Reorder the terms: -9 + 9x = 21 + 1x Solving -9 + 9x = 21 + 1x 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 + 9x + -1x = 21 + 1x + -1x Combine like terms: 9x + -1x = 8x -9 + 8x = 21 + 1x + -1x Combine like terms: 1x + -1x = 0 -9 + 8x = 21 + 0 -9 + 8x = 21 Add '9' to each side of the equation. -9 + 9 + 8x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 8x = 21 + 9 8x = 21 + 9 Combine like terms: 21 + 9 = 30 8x = 30 Divide each side by '8'. x = 3.75 Simplifying x = 3.75
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