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z=7/3=2i1/3
-4u=20/:(-4)
u=-5
t/5=9/*5
t=45
3/4v=9/*4v
3=36v
-36v=-3/:(-36)
v=3/36=1/12
z =
2) -4u = 20 | : (-4)
u = -5
3) = 9 | *5
t = 45
4) v = 9 | :
v = * = = 12