[mupad] factor of complex expressions

Hello,

Is it possible to reduce for example :
>> I*a+I*b+I*c

I a + I b + I c

to I*(a+b+c) (assuming that a,b,c are unknow) ?



I tried :
Using factor gives :
>> factor(%)

I a + I b + I c
and rectform :
>> rectform(I*a+I*b+I*c)

- (Im(a) + Im(b) + Im(c)) + I (Re(a) + Re(b) + Re(c))

Thanks,

JH
.