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A-
A
A+
Let
and
Compute 2A – 3B + 4C.
2A=
=
= 3B=
=
= 4C=
=
= 2A-3B+4C
=
=
Hence, 2A-3B+4C=
4
and 
Compute 2A – 3B + 4C.
=
=
=
and Compute 2A – 3B + 4C.===