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Simplifying x + 2x + (1 + 7x) = 21 Remove parenthesis around (1 + 7x) x + 2x + 1 + 7x = 21 Reorder the terms: 1 + x + 2x + 7x = 21 Combine like terms: x + 2x = 3x 1 + 3x + 7x = 21 Combine like terms: 3x + 7x = 10x 1 + 10x = 21 Solving 1 + 10x = 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 + -1 + 10x = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 10x = 21 + -1 10x = 21 + -1 Combine like terms: 21 + -1 = 20 10x = 20 Divide each side by '10'. x = 2 Simplifying x = 2
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