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Simplifying x + 7 + (x + 14) + (x + 21) = 126 Reorder the terms: x + 7 + (14 + x) + (x + 21) = 126 Remove parenthesis around (14 + x) x + 7 + 14 + x + (x + 21) = 126 Reorder the terms: x + 7 + 14 + x + (21 + x) = 126 Remove parenthesis around (21 + x) x + 7 + 14 + x + 21 + x = 126 Reorder the terms: 7 + 14 + 21 + x + x + x = 126 Combine like terms: 7 + 14 = 21 21 + 21 + x + x + x = 126 Combine like terms: 21 + 21 = 42 42 + x + x + x = 126 Combine like terms: x + x = 2x 42 + 2x + x = 126 Combine like terms: 2x + x = 3x 42 + 3x = 126 Solving 42 + 3x = 126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 3x = 126 + -42 Combine like terms: 42 + -42 = 0 0 + 3x = 126 + -42 3x = 126 + -42 Combine like terms: 126 + -42 = 84 3x = 84 Divide each side by '3'. x = 28 Simplifying x = 28
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