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