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Simplifying 3y + -21 = -12 + 4y Reorder the terms: -21 + 3y = -12 + 4y Solving -21 + 3y = -12 + 4y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4y' to each side of the equation. -21 + 3y + -4y = -12 + 4y + -4y Combine like terms: 3y + -4y = -1y -21 + -1y = -12 + 4y + -4y Combine like terms: 4y + -4y = 0 -21 + -1y = -12 + 0 -21 + -1y = -12 Add '21' to each side of the equation. -21 + 21 + -1y = -12 + 21 Combine like terms: -21 + 21 = 0 0 + -1y = -12 + 21 -1y = -12 + 21 Combine like terms: -12 + 21 = 9 -1y = 9 Divide each side by '-1'. y = -9 Simplifying y = -9
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