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Simplifying (3x + 21) + x = 61 Reorder the terms: (21 + 3x) + x = 61 Remove parenthesis around (21 + 3x) 21 + 3x + x = 61 Combine like terms: 3x + x = 4x 21 + 4x = 61 Solving 21 + 4x = 61 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 4x = 61 + -21 Combine like terms: 21 + -21 = 0 0 + 4x = 61 + -21 4x = 61 + -21 Combine like terms: 61 + -21 = 40 4x = 40 Divide each side by '4'. x = 10 Simplifying x = 10
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