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Simplifying x + 2x + 13 = 100 Reorder the terms: 13 + x + 2x = 100 Combine like terms: x + 2x = 3x 13 + 3x = 100 Solving 13 + 3x = 100 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 3x = 100 + -13 Combine like terms: 13 + -13 = 0 0 + 3x = 100 + -13 3x = 100 + -13 Combine like terms: 100 + -13 = 87 3x = 87 Divide each side by '3'. x = 29 Simplifying x = 29
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