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Simplifying 21y = 5(4y + -7) Reorder the terms: 21y = 5(-7 + 4y) 21y = (-7 * 5 + 4y * 5) 21y = (-35 + 20y) Solving 21y = -35 + 20y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-20y' to each side of the equation. 21y + -20y = -35 + 20y + -20y Combine like terms: 21y + -20y = 1y 1y = -35 + 20y + -20y Combine like terms: 20y + -20y = 0 1y = -35 + 0 1y = -35 Divide each side by '1'. y = -35 Simplifying y = -35
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