HP -28S Manual page 117

Now that
x
occurs only once in the equation, you can isolate
x.
Specify the variable you want to isolate.
~------~~~~~~~-=~
~
X
2: ' C3*B+C-2*A)/5'
1: 'A*B+(A+2)*X=C'
, XI3
tlJml!HllCll!lmlllmDMmDimm
Isolate x.
[NEXT
I
ISOL
The expression returned represents a symbolic solution of the equa-
tion for x-that is, the equation
a(x
+
b)
+
2x
=
c
is satisfied when
x
(c - ab)j(a
+
2).
116 9: Symbolic Solutions