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Simplifying 2x + (x + 100) = 400 Reorder the terms: 2x + (100 + x) = 400 Remove parenthesis around (100 + x) 2x + 100 + x = 400 Reorder the terms: 100 + 2x + x = 400 Combine like terms: 2x + x = 3x 100 + 3x = 400 Solving 100 + 3x = 400 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-100' to each side of the equation. 100 + -100 + 3x = 400 + -100 Combine like terms: 100 + -100 = 0 0 + 3x = 400 + -100 3x = 400 + -100 Combine like terms: 400 + -100 = 300 3x = 300 Divide each side by '3'. x = 100 Simplifying x = 100
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