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Simplifying 7(3x + 9) + -9x = 243 Reorder the terms: 7(9 + 3x) + -9x = 243 (9 * 7 + 3x * 7) + -9x = 243 (63 + 21x) + -9x = 243 Combine like terms: 21x + -9x = 12x 63 + 12x = 243 Solving 63 + 12x = 243 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + 12x = 243 + -63 Combine like terms: 63 + -63 = 0 0 + 12x = 243 + -63 12x = 243 + -63 Combine like terms: 243 + -63 = 180 12x = 180 Divide each side by '12'. x = 15 Simplifying x = 15
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