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Simplifying x + (x + 7) + (x + 14) = 126 Reorder the terms: x + (7 + x) + (x + 14) = 126 Remove parenthesis around (7 + x) x + 7 + x + (x + 14) = 126 Reorder the terms: x + 7 + x + (14 + x) = 126 Remove parenthesis around (14 + x) x + 7 + x + 14 + x = 126 Reorder the terms: 7 + 14 + x + x + x = 126 Combine like terms: 7 + 14 = 21 21 + x + x + x = 126 Combine like terms: x + x = 2x 21 + 2x + x = 126 Combine like terms: 2x + x = 3x 21 + 3x = 126 Solving 21 + 3x = 126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3x = 126 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 126 + -21 3x = 126 + -21 Combine like terms: 126 + -21 = 105 3x = 105 Divide each side by '3'. x = 35 Simplifying x = 35
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