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Simplifying x + (x + 4) + (x + 21) = 136 Reorder the terms: x + (4 + x) + (x + 21) = 136 Remove parenthesis around (4 + x) x + 4 + x + (x + 21) = 136 Reorder the terms: x + 4 + x + (21 + x) = 136 Remove parenthesis around (21 + x) x + 4 + x + 21 + x = 136 Reorder the terms: 4 + 21 + x + x + x = 136 Combine like terms: 4 + 21 = 25 25 + x + x + x = 136 Combine like terms: x + x = 2x 25 + 2x + x = 136 Combine like terms: 2x + x = 3x 25 + 3x = 136 Solving 25 + 3x = 136 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + 3x = 136 + -25 Combine like terms: 25 + -25 = 0 0 + 3x = 136 + -25 3x = 136 + -25 Combine like terms: 136 + -25 = 111 3x = 111 Divide each side by '3'. x = 37 Simplifying x = 37
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