Question

X+Y+z=813
X+y=605
Y+z=383
X=?
Y=?
Z=?

Answer 1

x+y+z=813
x+y=605 =>x=605-y
y+z=383 =>z=383-y
605-y+y+383-y=813
-y=813-605-383
-y=-175 |×(-1)
y=175
x=605-y
x=605-175
x=430
z=383-y
z=383-175
z=208