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Simplifying x + (x + 7) + (x + 14) + (x + 21) + (x + 28) = 125 Reorder the terms: x + (7 + x) + (x + 14) + (x + 21) + (x + 28) = 125 Remove parenthesis around (7 + x) x + 7 + x + (x + 14) + (x + 21) + (x + 28) = 125 Reorder the terms: x + 7 + x + (14 + x) + (x + 21) + (x + 28) = 125 Remove parenthesis around (14 + x) x + 7 + x + 14 + x + (x + 21) + (x + 28) = 125 Reorder the terms: x + 7 + x + 14 + x + (21 + x) + (x + 28) = 125 Remove parenthesis around (21 + x) x + 7 + x + 14 + x + 21 + x + (x + 28) = 125 Reorder the terms: x + 7 + x + 14 + x + 21 + x + (28 + x) = 125 Remove parenthesis around (28 + x) x + 7 + x + 14 + x + 21 + x + 28 + x = 125 Reorder the terms: 7 + 14 + 21 + 28 + x + x + x + x + x = 125 Combine like terms: 7 + 14 = 21 21 + 21 + 28 + x + x + x + x + x = 125 Combine like terms: 21 + 21 = 42 42 + 28 + x + x + x + x + x = 125 Combine like terms: 42 + 28 = 70 70 + x + x + x + x + x = 125 Combine like terms: x + x = 2x 70 + 2x + x + x + x = 125 Combine like terms: 2x + x = 3x 70 + 3x + x + x = 125 Combine like terms: 3x + x = 4x 70 + 4x + x = 125 Combine like terms: 4x + x = 5x 70 + 5x = 125 Solving 70 + 5x = 125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-70' to each side of the equation. 70 + -70 + 5x = 125 + -70 Combine like terms: 70 + -70 = 0 0 + 5x = 125 + -70 5x = 125 + -70 Combine like terms: 125 + -70 = 55 5x = 55 Divide each side by '5'. x = 11 Simplifying x = 11
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