$Solve for y :$
$4 y - 21 = y$

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Solution

The correct option is D 7
Given,
$4 y - 21 = y$
$\Rightarrow 4 y - y = 21$
$\Rightarrow 3 y = 21$
$\Rightarrow y = \frac{21}{3}$
$\Rightarrow y = 7$

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