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Simplifying x + (x + 4) + (x + 8) = 21 Reorder the terms: x + (4 + x) + (x + 8) = 21 Remove parenthesis around (4 + x) x + 4 + x + (x + 8) = 21 Reorder the terms: x + 4 + x + (8 + x) = 21 Remove parenthesis around (8 + x) x + 4 + x + 8 + x = 21 Reorder the terms: 4 + 8 + x + x + x = 21 Combine like terms: 4 + 8 = 12 12 + x + x + x = 21 Combine like terms: x + x = 2x 12 + 2x + x = 21 Combine like terms: 2x + x = 3x 12 + 3x = 21 Solving 12 + 3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 3x = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 3x = 21 + -12 3x = 21 + -12 Combine like terms: 21 + -12 = 9 3x = 9 Divide each side by '3'. x = 3 Simplifying x = 3
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