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Simplifying 8y + -21 = 15 + 4y Reorder the terms: -21 + 8y = 15 + 4y Solving -21 + 8y = 15 + 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. -21 + 8y + -4y = 15 + 4y + -4y Combine like terms: 8y + -4y = 4y -21 + 4y = 15 + 4y + -4y Combine like terms: 4y + -4y = 0 -21 + 4y = 15 + 0 -21 + 4y = 15 Add '21' to each side of the equation. -21 + 21 + 4y = 15 + 21 Combine like terms: -21 + 21 = 0 0 + 4y = 15 + 21 4y = 15 + 21 Combine like terms: 15 + 21 = 36 4y = 36 Divide each side by '4'. y = 9 Simplifying y = 9
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