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Simplifying (3x + 21) + -5 = 28 Reorder the terms: (21 + 3x) + -5 = 28 Remove parenthesis around (21 + 3x) 21 + 3x + -5 = 28 Reorder the terms: 21 + -5 + 3x = 28 Combine like terms: 21 + -5 = 16 16 + 3x = 28 Solving 16 + 3x = 28 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-16' to each side of the equation. 16 + -16 + 3x = 28 + -16 Combine like terms: 16 + -16 = 0 0 + 3x = 28 + -16 3x = 28 + -16 Combine like terms: 28 + -16 = 12 3x = 12 Divide each side by '3'. x = 4 Simplifying x = 4
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