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Simplifying 3x + 9 = 21 + -1x Reorder the terms: 9 + 3x = 21 + -1x Solving 9 + 3x = 21 + -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 + 3x + x = 21 + -1x + x Combine like terms: 3x + x = 4x 9 + 4x = 21 + -1x + x Combine like terms: -1x + x = 0 9 + 4x = 21 + 0 9 + 4x = 21 Add '-9' to each side of the equation. 9 + -9 + 4x = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 4x = 21 + -9 4x = 21 + -9 Combine like terms: 21 + -9 = 12 4x = 12 Divide each side by '4'. x = 3 Simplifying x = 3
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