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Simplifying 21x + 30 = 9x + 66 Reorder the terms: 30 + 21x = 9x + 66 Reorder the terms: 30 + 21x = 66 + 9x Solving 30 + 21x = 66 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 30 + 21x + -9x = 66 + 9x + -9x Combine like terms: 21x + -9x = 12x 30 + 12x = 66 + 9x + -9x Combine like terms: 9x + -9x = 0 30 + 12x = 66 + 0 30 + 12x = 66 Add '-30' to each side of the equation. 30 + -30 + 12x = 66 + -30 Combine like terms: 30 + -30 = 0 0 + 12x = 66 + -30 12x = 66 + -30 Combine like terms: 66 + -30 = 36 12x = 36 Divide each side by '12'. x = 3 Simplifying x = 3
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