Hello Rosh,
You just have substitute the variables by numbers. As you can see, the function involved is '+' addition.
Starting with 'x', x+4=1, x=-3
y+4=-5, y=-9
e-3=7, e=10
z+10=10, z=0
f-3=2, f=5
Then, n=10-9=1 and m=4+0=4, m+n=5
Hope it helps.
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