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A-
A
A+
Find x, y, z and t, if
+
=
=
=
=
=7
=14
=
=7-3
=14+4
=
=4
=18
=
=2
=9
Hence,
=2,
=9
19
+
=
=7 
=14
=7-3 
=14+4
=4 
=18
=2 
=9
=2,
=9+==7 =14=7-3 =14+4=4 =18=2 =9=2,=9