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Simplifying 3(7x + 9) + 10 = 142 Reorder the terms: 3(9 + 7x) + 10 = 142 (9 * 3 + 7x * 3) + 10 = 142 (27 + 21x) + 10 = 142 Reorder the terms: 27 + 10 + 21x = 142 Combine like terms: 27 + 10 = 37 37 + 21x = 142 Solving 37 + 21x = 142 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-37' to each side of the equation. 37 + -37 + 21x = 142 + -37 Combine like terms: 37 + -37 = 0 0 + 21x = 142 + -37 21x = 142 + -37 Combine like terms: 142 + -37 = 105 21x = 105 Divide each side by '21'. x = 5 Simplifying x = 5
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