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Simplifying 7x + 2(3x + 13) = 143 Reorder the terms: 7x + 2(13 + 3x) = 143 7x + (13 * 2 + 3x * 2) = 143 7x + (26 + 6x) = 143 Reorder the terms: 26 + 7x + 6x = 143 Combine like terms: 7x + 6x = 13x 26 + 13x = 143 Solving 26 + 13x = 143 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-26' to each side of the equation. 26 + -26 + 13x = 143 + -26 Combine like terms: 26 + -26 = 0 0 + 13x = 143 + -26 13x = 143 + -26 Combine like terms: 143 + -26 = 117 13x = 117 Divide each side by '13'. x = 9 Simplifying x = 9
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