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Simplifying 3x + 2(5x + 10) = 137 Reorder the terms: 3x + 2(10 + 5x) = 137 3x + (10 * 2 + 5x * 2) = 137 3x + (20 + 10x) = 137 Reorder the terms: 20 + 3x + 10x = 137 Combine like terms: 3x + 10x = 13x 20 + 13x = 137 Solving 20 + 13x = 137 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 13x = 137 + -20 Combine like terms: 20 + -20 = 0 0 + 13x = 137 + -20 13x = 137 + -20 Combine like terms: 137 + -20 = 117 13x = 117 Divide each side by '13'. x = 9 Simplifying x = 9
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