HP HP-28S - 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