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Simplifying -21 = -3y + 6(y + -5) Reorder the terms: -21 = -3y + 6(-5 + y) -21 = -3y + (-5 * 6 + y * 6) -21 = -3y + (-30 + 6y) Reorder the terms: -21 = -30 + -3y + 6y Combine like terms: -3y + 6y = 3y -21 = -30 + 3y Solving -21 = -30 + 3y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3y' to each side of the equation. -21 + -3y = -30 + 3y + -3y Combine like terms: 3y + -3y = 0 -21 + -3y = -30 + 0 -21 + -3y = -30 Add '21' to each side of the equation. -21 + 21 + -3y = -30 + 21 Combine like terms: -21 + 21 = 0 0 + -3y = -30 + 21 -3y = -30 + 21 Combine like terms: -30 + 21 = -9 -3y = -9 Divide each side by '-3'. y = 3 Simplifying y = 3
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