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Simplifying (x + 2) + (3x + 1) + (x + 7) = 140 Reorder the terms: (2 + x) + (3x + 1) + (x + 7) = 140 Remove parenthesis around (2 + x) 2 + x + (3x + 1) + (x + 7) = 140 Reorder the terms: 2 + x + (1 + 3x) + (x + 7) = 140 Remove parenthesis around (1 + 3x) 2 + x + 1 + 3x + (x + 7) = 140 Reorder the terms: 2 + x + 1 + 3x + (7 + x) = 140 Remove parenthesis around (7 + x) 2 + x + 1 + 3x + 7 + x = 140 Reorder the terms: 2 + 1 + 7 + x + 3x + x = 140 Combine like terms: 2 + 1 = 3 3 + 7 + x + 3x + x = 140 Combine like terms: 3 + 7 = 10 10 + x + 3x + x = 140 Combine like terms: x + 3x = 4x 10 + 4x + x = 140 Combine like terms: 4x + x = 5x 10 + 5x = 140 Solving 10 + 5x = 140 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + 5x = 140 + -10 Combine like terms: 10 + -10 = 0 0 + 5x = 140 + -10 5x = 140 + -10 Combine like terms: 140 + -10 = 130 5x = 130 Divide each side by '5'. x = 26 Simplifying x = 26
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