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Simplifying 12y + -21 = 3y + -12 Reorder the terms: -21 + 12y = 3y + -12 Reorder the terms: -21 + 12y = -12 + 3y Solving -21 + 12y = -12 + 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 + 12y + -3y = -12 + 3y + -3y Combine like terms: 12y + -3y = 9y -21 + 9y = -12 + 3y + -3y Combine like terms: 3y + -3y = 0 -21 + 9y = -12 + 0 -21 + 9y = -12 Add '21' to each side of the equation. -21 + 21 + 9y = -12 + 21 Combine like terms: -21 + 21 = 0 0 + 9y = -12 + 21 9y = -12 + 21 Combine like terms: -12 + 21 = 9 9y = 9 Divide each side by '9'. y = 1 Simplifying y = 1
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