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Simplifying -21 = 3y + -6 Reorder the terms: -21 = -6 + 3y Solving -21 = -6 + 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 = -6 + 3y + -3y Combine like terms: 3y + -3y = 0 -21 + -3y = -6 + 0 -21 + -3y = -6 Add '21' to each side of the equation. -21 + 21 + -3y = -6 + 21 Combine like terms: -21 + 21 = 0 0 + -3y = -6 + 21 -3y = -6 + 21 Combine like terms: -6 + 21 = 15 -3y = 15 Divide each side by '-3'. y = -5 Simplifying y = -5
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