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Simplifying x + (x + 1) + (x + 3) = 21 Reorder the terms: x + (1 + x) + (x + 3) = 21 Remove parenthesis around (1 + x) x + 1 + x + (x + 3) = 21 Reorder the terms: x + 1 + x + (3 + x) = 21 Remove parenthesis around (3 + x) x + 1 + x + 3 + x = 21 Reorder the terms: 1 + 3 + x + x + x = 21 Combine like terms: 1 + 3 = 4 4 + x + x + x = 21 Combine like terms: x + x = 2x 4 + 2x + x = 21 Combine like terms: 2x + x = 3x 4 + 3x = 21 Solving 4 + 3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 3x = 21 + -4 Combine like terms: 4 + -4 = 0 0 + 3x = 21 + -4 3x = 21 + -4 Combine like terms: 21 + -4 = 17 3x = 17 Divide each side by '3'. x = 5.666666667 Simplifying x = 5.666666667
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