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Simplifying 21 = 9 + 4(2y + -5) Reorder the terms: 21 = 9 + 4(-5 + 2y) 21 = 9 + (-5 * 4 + 2y * 4) 21 = 9 + (-20 + 8y) Combine like terms: 9 + -20 = -11 21 = -11 + 8y Solving 21 = -11 + 8y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-8y' to each side of the equation. 21 + -8y = -11 + 8y + -8y Combine like terms: 8y + -8y = 0 21 + -8y = -11 + 0 21 + -8y = -11 Add '-21' to each side of the equation. 21 + -21 + -8y = -11 + -21 Combine like terms: 21 + -21 = 0 0 + -8y = -11 + -21 -8y = -11 + -21 Combine like terms: -11 + -21 = -32 -8y = -32 Divide each side by '-8'. y = 4 Simplifying y = 4
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