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Simplifying 3x + 5[3x + 6] = 138 Reorder the terms: 3x + 5[6 + 3x] = 138 3x + [6 * 5 + 3x * 5] = 138 3x + [30 + 15x] = 138 Reorder the terms: 30 + 3x + 15x = 138 Combine like terms: 3x + 15x = 18x 30 + 18x = 138 Solving 30 + 18x = 138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 18x = 138 + -30 Combine like terms: 30 + -30 = 0 0 + 18x = 138 + -30 18x = 138 + -30 Combine like terms: 138 + -30 = 108 18x = 108 Divide each side by '18'. x = 6 Simplifying x = 6
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