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Solving Equations with Linear Expressions on One Side and Numbers on the Other Side

Question

Solve $y - 9 = 21$ for the value of $y$ .

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Solution

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Given, $y - 9 = 21$
Add $9$ on both the sides,
$y - 9 + 9 = 21 + 9$
$∴ y = 30$

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