Question

If $z=4(z-9)$, then $z=$?

Answer 1

Evaluate the given expression:

The given expression is, $z=4(z-9)$

$\Rightarrow$ $z=4z-36$

$\Rightarrow$$4z-36=z$

$\Rightarrow$ $4z-z=36$ [Transposing $z$ to LHS and $-36$ to RHS]

$\Rightarrow$ $3z=36$

$\Rightarrow$ $\frac{3z}{3}=\frac{36}{3}$ [Dividing both sides by $3$ ]

$\Rightarrow$ $z=12$

Hence, the required value of $z$ is $12$.