Using componendo and dividendo, find the value of x:
3x +4+ 3x-5
= 9
3x +4-13x-5
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−(
3x+4
−
3x−5
)+(
3x+4
+
3x−5
)
3x+4
+
3x−5
+
3x+4
−
3x−5
=
9−1
9+1
2
3x−5
2
3x+4
=
8
10
3x−5
3x+4
=
64
100
64(3x+4)=100(3x−5)
256=108x−500
756=108x
x=7
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