
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
In a magic square, the sum of the three entries in any row, column, or diagonal must be the same. Consider the magic square shown below, where some of the entries are known. Determine the value of $y$.
[asy]
size(2cm);
for (int i=0; i<=3; ++i) draw((i,0)--(i,3)^^(0,i)--(3,i));
label("$y$",(0.5,2.5));label("$25$",(1.5,2.5));
label("$70$",(2.5,2.5));label("$5$",(0.5,1.5));
[/asy]

Present the answer in LaTex format: \boxed{Your answer}
user