3y

^{2}+51=918-
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3y^{2}+51=918

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3y^{2} + 51 = 918

Subtract 51 from both sides:

3y^{2} = 918 - 51 = 867

Divide both sides by 3:

y^{2} = 867/3 = 289

Take the square root of both sides:

√y^{2} = √289

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