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Simplifying 21x + 9 = 12x + 72 Reorder the terms: 9 + 21x = 12x + 72 Reorder the terms: 9 + 21x = 72 + 12x Solving 9 + 21x = 72 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. 9 + 21x + -12x = 72 + 12x + -12x Combine like terms: 21x + -12x = 9x 9 + 9x = 72 + 12x + -12x Combine like terms: 12x + -12x = 0 9 + 9x = 72 + 0 9 + 9x = 72 Add '-9' to each side of the equation. 9 + -9 + 9x = 72 + -9 Combine like terms: 9 + -9 = 0 0 + 9x = 72 + -9 9x = 72 + -9 Combine like terms: 72 + -9 = 63 9x = 63 Divide each side by '9'. x = 7 Simplifying x = 7
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