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Simplifying -15 = 21 + -12y Solving -15 = 21 + -12y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '12y' to each side of the equation. -15 + 12y = 21 + -12y + 12y Combine like terms: -12y + 12y = 0 -15 + 12y = 21 + 0 -15 + 12y = 21 Add '15' to each side of the equation. -15 + 15 + 12y = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 12y = 21 + 15 12y = 21 + 15 Combine like terms: 21 + 15 = 36 12y = 36 Divide each side by '12'. y = 3 Simplifying y = 3
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