SOlve this one then

[spanishfly]

You want it

[andrew_lumb]

a + b = g
a + g = ?

a - g = -b (re-arrangement of the original equation)

a - g + 2g = a + g = -b + 2g (adding 2g to both sides)

a + g = 2g - b

but.. b = g - a

so.. a + g = 2g - g + a = g + a

so we come to the conlcusion that a + g = a + g

which is feckin pointless!