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Simplifying 21 = -7(4y + 5) Reorder the terms: 21 = -7(5 + 4y) 21 = (5 * -7 + 4y * -7) 21 = (-35 + -28y) Solving 21 = -35 + -28y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '28y' to each side of the equation. 21 + 28y = -35 + -28y + 28y Combine like terms: -28y + 28y = 0 21 + 28y = -35 + 0 21 + 28y = -35 Add '-21' to each side of the equation. 21 + -21 + 28y = -35 + -21 Combine like terms: 21 + -21 = 0 0 + 28y = -35 + -21 28y = -35 + -21 Combine like terms: -35 + -21 = -56 28y = -56 Divide each side by '28'. y = -2 Simplifying y = -2
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