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Simplifying 7x + 4(x + 18) = 138 Reorder the terms: 7x + 4(18 + x) = 138 7x + (18 * 4 + x * 4) = 138 7x + (72 + 4x) = 138 Reorder the terms: 72 + 7x + 4x = 138 Combine like terms: 7x + 4x = 11x 72 + 11x = 138 Solving 72 + 11x = 138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-72' to each side of the equation. 72 + -72 + 11x = 138 + -72 Combine like terms: 72 + -72 = 0 0 + 11x = 138 + -72 11x = 138 + -72 Combine like terms: 138 + -72 = 66 11x = 66 Divide each side by '11'. x = 6 Simplifying x = 6
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