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Simplifying 121 = x + 2x + (x + 21) Reorder the terms: 121 = x + 2x + (21 + x) Remove parenthesis around (21 + x) 121 = x + 2x + 21 + x Reorder the terms: 121 = 21 + x + 2x + x Combine like terms: x + 2x = 3x 121 = 21 + 3x + x Combine like terms: 3x + x = 4x 121 = 21 + 4x Solving 121 = 21 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 121 + -4x = 21 + 4x + -4x Combine like terms: 4x + -4x = 0 121 + -4x = 21 + 0 121 + -4x = 21 Add '-121' to each side of the equation. 121 + -121 + -4x = 21 + -121 Combine like terms: 121 + -121 = 0 0 + -4x = 21 + -121 -4x = 21 + -121 Combine like terms: 21 + -121 = -100 -4x = -100 Divide each side by '-4'. x = 25 Simplifying x = 25
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