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Simplifying 21(Y + -4) = 54 Reorder the terms: 21(-4 + Y) = 54 (-4 * 21 + Y * 21) = 54 (-84 + 21Y) = 54 Solving -84 + 21Y = 54 Solving for variable 'Y'. Move all terms containing Y to the left, all other terms to the right. Add '84' to each side of the equation. -84 + 84 + 21Y = 54 + 84 Combine like terms: -84 + 84 = 0 0 + 21Y = 54 + 84 21Y = 54 + 84 Combine like terms: 54 + 84 = 138 21Y = 138 Divide each side by '21'. Y = 6.571428571 Simplifying Y = 6.571428571
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