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Simplifying 7x + 3(2x + 4) = 168 Reorder the terms: 7x + 3(4 + 2x) = 168 7x + (4 * 3 + 2x * 3) = 168 7x + (12 + 6x) = 168 Reorder the terms: 12 + 7x + 6x = 168 Combine like terms: 7x + 6x = 13x 12 + 13x = 168 Solving 12 + 13x = 168 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 13x = 168 + -12 Combine like terms: 12 + -12 = 0 0 + 13x = 168 + -12 13x = 168 + -12 Combine like terms: 168 + -12 = 156 13x = 156 Divide each side by '13'. x = 12 Simplifying x = 12
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