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Simplifying 4x + 2(4x + 15) = 138 Reorder the terms: 4x + 2(15 + 4x) = 138 4x + (15 * 2 + 4x * 2) = 138 4x + (30 + 8x) = 138 Reorder the terms: 30 + 4x + 8x = 138 Combine like terms: 4x + 8x = 12x 30 + 12x = 138 Solving 30 + 12x = 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 + 12x = 138 + -30 Combine like terms: 30 + -30 = 0 0 + 12x = 138 + -30 12x = 138 + -30 Combine like terms: 138 + -30 = 108 12x = 108 Divide each side by '12'. x = 9 Simplifying x = 9
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