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Simplifying X + (x + 8) + x = 77 Reorder the terms: X + (8 + x) + x = 77 Remove parenthesis around (8 + x) X + 8 + x + x = 77 Reorder the terms: 8 + X + x + x = 77 Combine like terms: x + x = 2x 8 + X + 2x = 77 Solving 8 + X + 2x = 77 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + X + -8 + 2x = 77 + -8 Reorder the terms: 8 + -8 + X + 2x = 77 + -8 Combine like terms: 8 + -8 = 0 0 + X + 2x = 77 + -8 X + 2x = 77 + -8 Combine like terms: 77 + -8 = 69 X + 2x = 69 Add '-2x' to each side of the equation. X + 2x + -2x = 69 + -2x Combine like terms: 2x + -2x = 0 X + 0 = 69 + -2x X = 69 + -2x Simplifying X = 69 + -2x
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