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Simplifying -21 + 4y = 42 Solving -21 + 4y = 42 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 + 4y = 42 + 21 Combine like terms: -21 + 21 = 0 0 + 4y = 42 + 21 4y = 42 + 21 Combine like terms: 42 + 21 = 63 4y = 63 Divide each side by '4'. y = 15.75 Simplifying y = 15.75
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