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Simplifying X + 2x + 7x + 1 = 21 Reorder the terms: 1 + X + 2x + 7x = 21 Combine like terms: 2x + 7x = 9x 1 + X + 9x = 21 Solving 1 + X + 9x = 21 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + X + -1 + 9x = 21 + -1 Reorder the terms: 1 + -1 + X + 9x = 21 + -1 Combine like terms: 1 + -1 = 0 0 + X + 9x = 21 + -1 X + 9x = 21 + -1 Combine like terms: 21 + -1 = 20 X + 9x = 20 Add '-9x' to each side of the equation. X + 9x + -9x = 20 + -9x Combine like terms: 9x + -9x = 0 X + 0 = 20 + -9x X = 20 + -9x Simplifying X = 20 + -9x
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