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Simplifying 4y + -1(21 + -1y) = 12 4y + (21 * -1 + -1y * -1) = 12 4y + (-21 + 1y) = 12 Reorder the terms: -21 + 4y + 1y = 12 Combine like terms: 4y + 1y = 5y -21 + 5y = 12 Solving -21 + 5y = 12 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 5y = 12 + 21 Combine like terms: -21 + 21 = 0 0 + 5y = 12 + 21 5y = 12 + 21 Combine like terms: 12 + 21 = 33 5y = 33 Divide each side by '5'. y = 6.6 Simplifying y = 6.6
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