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Simplifying 3(15x + 100) = 840 Reorder the terms: 3(100 + 15x) = 840 (100 * 3 + 15x * 3) = 840 (300 + 45x) = 840 Solving 300 + 45x = 840 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-300' to each side of the equation. 300 + -300 + 45x = 840 + -300 Combine like terms: 300 + -300 = 0 0 + 45x = 840 + -300 45x = 840 + -300 Combine like terms: 840 + -300 = 540 45x = 540 Divide each side by '45'. x = 12 Simplifying x = 12
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