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Simplifying 21(2y + 1) = 0 Reorder the terms: 21(1 + 2y) = 0 (1 * 21 + 2y * 21) = 0 (21 + 42y) = 0 Solving 21 + 42y = 0 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 42y = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 42y = 0 + -21 42y = 0 + -21 Combine like terms: 0 + -21 = -21 42y = -21 Divide each side by '42'. y = -0.5 Simplifying y = -0.5
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