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Simplifying 21x + 16 + -8x = 42 Reorder the terms: 16 + 21x + -8x = 42 Combine like terms: 21x + -8x = 13x 16 + 13x = 42 Solving 16 + 13x = 42 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 + 13x = 42 + -16 Combine like terms: 16 + -16 = 0 0 + 13x = 42 + -16 13x = 42 + -16 Combine like terms: 42 + -16 = 26 13x = 26 Divide each side by '13'. x = 2 Simplifying x = 2
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