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Simplifying 21 = 5(y + 5) + -3y Reorder the terms: 21 = 5(5 + y) + -3y 21 = (5 * 5 + y * 5) + -3y 21 = (25 + 5y) + -3y Combine like terms: 5y + -3y = 2y 21 = 25 + 2y Solving 21 = 25 + 2y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2y' to each side of the equation. 21 + -2y = 25 + 2y + -2y Combine like terms: 2y + -2y = 0 21 + -2y = 25 + 0 21 + -2y = 25 Add '-21' to each side of the equation. 21 + -21 + -2y = 25 + -21 Combine like terms: 21 + -21 = 0 0 + -2y = 25 + -21 -2y = 25 + -21 Combine like terms: 25 + -21 = 4 -2y = 4 Divide each side by '-2'. y = -2 Simplifying y = -2
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