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Simplifying 3x + 2(7x + 3) = 142 Reorder the terms: 3x + 2(3 + 7x) = 142 3x + (3 * 2 + 7x * 2) = 142 3x + (6 + 14x) = 142 Reorder the terms: 6 + 3x + 14x = 142 Combine like terms: 3x + 14x = 17x 6 + 17x = 142 Solving 6 + 17x = 142 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 17x = 142 + -6 Combine like terms: 6 + -6 = 0 0 + 17x = 142 + -6 17x = 142 + -6 Combine like terms: 142 + -6 = 136 17x = 136 Divide each side by '17'. x = 8 Simplifying x = 8
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