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Simplifying 3x + 7(3x + -18) = 138 Reorder the terms: 3x + 7(-18 + 3x) = 138 3x + (-18 * 7 + 3x * 7) = 138 3x + (-126 + 21x) = 138 Reorder the terms: -126 + 3x + 21x = 138 Combine like terms: 3x + 21x = 24x -126 + 24x = 138 Solving -126 + 24x = 138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '126' to each side of the equation. -126 + 126 + 24x = 138 + 126 Combine like terms: -126 + 126 = 0 0 + 24x = 138 + 126 24x = 138 + 126 Combine like terms: 138 + 126 = 264 24x = 264 Divide each side by '24'. x = 11 Simplifying x = 11
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