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Simplifying 21x = 3(2x + 30) Reorder the terms: 21x = 3(30 + 2x) 21x = (30 * 3 + 2x * 3) 21x = (90 + 6x) Solving 21x = 90 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. 21x + -6x = 90 + 6x + -6x Combine like terms: 21x + -6x = 15x 15x = 90 + 6x + -6x Combine like terms: 6x + -6x = 0 15x = 90 + 0 15x = 90 Divide each side by '15'. x = 6 Simplifying x = 6
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