What is $z$ $z$ in this equation $2 a - z = a$ $2a - z = a$ ?

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Answer 1 · 2016-07-11T20:03:36

In the equation, $z$ $z$ is equivalent to $a$ $a$ .

Let's solve for $z$ $z$ .

$2 a - z = a$ $2a - z = a$

Get the variable all by itself (isolate $z$ $z$ ).
Use additive inverse to add $z$ $z$ to both sides.

$2 a - z + z = a + z$ $2a - z + z = a + z$

$2a cancel(-z + z) = a + z$

$2a = a + z$

Now we need to subtract $a$ and get it on the left side.

$2a - a = a -a + z$

$2a - a = cancel(a-a) + z$

$a = z$

And we just found that $z = a$ !

What is zz z in this equation 2a - z = a2a−z=a 2a - z = a ?