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Simplifying 3x + -9 = 2x + 21 Reorder the terms: -9 + 3x = 2x + 21 Reorder the terms: -9 + 3x = 21 + 2x Solving -9 + 3x = 21 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. -9 + 3x + -2x = 21 + 2x + -2x Combine like terms: 3x + -2x = 1x -9 + 1x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 -9 + 1x = 21 + 0 -9 + 1x = 21 Add '9' to each side of the equation. -9 + 9 + 1x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 1x = 21 + 9 1x = 21 + 9 Combine like terms: 21 + 9 = 30 1x = 30 Divide each side by '1'. x = 30 Simplifying x = 30
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