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Simplifying -12 = y + -21 Reorder the terms: -12 = -21 + y Solving -12 = -21 + y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1y' to each side of the equation. -12 + -1y = -21 + y + -1y Combine like terms: y + -1y = 0 -12 + -1y = -21 + 0 -12 + -1y = -21 Add '12' to each side of the equation. -12 + 12 + -1y = -21 + 12 Combine like terms: -12 + 12 = 0 0 + -1y = -21 + 12 -1y = -21 + 12 Combine like terms: -21 + 12 = -9 -1y = -9 Divide each side by '-1'. y = 9 Simplifying y = 9
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