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Simplifying 7x + 3(3x + 15) = 125 Reorder the terms: 7x + 3(15 + 3x) = 125 7x + (15 * 3 + 3x * 3) = 125 7x + (45 + 9x) = 125 Reorder the terms: 45 + 7x + 9x = 125 Combine like terms: 7x + 9x = 16x 45 + 16x = 125 Solving 45 + 16x = 125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-45' to each side of the equation. 45 + -45 + 16x = 125 + -45 Combine like terms: 45 + -45 = 0 0 + 16x = 125 + -45 16x = 125 + -45 Combine like terms: 125 + -45 = 80 16x = 80 Divide each side by '16'. x = 5 Simplifying x = 5
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