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Simplifying -9y + -21 = -4(y + 9) Reorder the terms: -21 + -9y = -4(y + 9) Reorder the terms: -21 + -9y = -4(9 + y) -21 + -9y = (9 * -4 + y * -4) -21 + -9y = (-36 + -4y) Solving -21 + -9y = -36 + -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 + -9y + 4y = -36 + -4y + 4y Combine like terms: -9y + 4y = -5y -21 + -5y = -36 + -4y + 4y Combine like terms: -4y + 4y = 0 -21 + -5y = -36 + 0 -21 + -5y = -36 Add '21' to each side of the equation. -21 + 21 + -5y = -36 + 21 Combine like terms: -21 + 21 = 0 0 + -5y = -36 + 21 -5y = -36 + 21 Combine like terms: -36 + 21 = -15 -5y = -15 Divide each side by '-5'. y = 3 Simplifying y = 3
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