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Simplifying 9 = 21 + -4y Solving 9 = 21 + -4y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4y' to each side of the equation. 9 + 4y = 21 + -4y + 4y Combine like terms: -4y + 4y = 0 9 + 4y = 21 + 0 9 + 4y = 21 Add '-9' to each side of the equation. 9 + -9 + 4y = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 4y = 21 + -9 4y = 21 + -9 Combine like terms: 21 + -9 = 12 4y = 12 Divide each side by '4'. y = 3 Simplifying y = 3
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