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Simplifying 5x + (7x + 3) + (7x + 6) = 142 Reorder the terms: 5x + (3 + 7x) + (7x + 6) = 142 Remove parenthesis around (3 + 7x) 5x + 3 + 7x + (7x + 6) = 142 Reorder the terms: 5x + 3 + 7x + (6 + 7x) = 142 Remove parenthesis around (6 + 7x) 5x + 3 + 7x + 6 + 7x = 142 Reorder the terms: 3 + 6 + 5x + 7x + 7x = 142 Combine like terms: 3 + 6 = 9 9 + 5x + 7x + 7x = 142 Combine like terms: 5x + 7x = 12x 9 + 12x + 7x = 142 Combine like terms: 12x + 7x = 19x 9 + 19x = 142 Solving 9 + 19x = 142 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 19x = 142 + -9 Combine like terms: 9 + -9 = 0 0 + 19x = 142 + -9 19x = 142 + -9 Combine like terms: 142 + -9 = 133 19x = 133 Divide each side by '19'. x = 7 Simplifying x = 7
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