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Simplifying 6x + 7(x + 3) = 138 Reorder the terms: 6x + 7(3 + x) = 138 6x + (3 * 7 + x * 7) = 138 6x + (21 + 7x) = 138 Reorder the terms: 21 + 6x + 7x = 138 Combine like terms: 6x + 7x = 13x 21 + 13x = 138 Solving 21 + 13x = 138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 13x = 138 + -21 Combine like terms: 21 + -21 = 0 0 + 13x = 138 + -21 13x = 138 + -21 Combine like terms: 138 + -21 = 117 13x = 117 Divide each side by '13'. x = 9 Simplifying x = 9
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