Fourier transform of given signal This is the signal whose FT i need to find, at first i thought that i could solve this as a convolution of two rectangular pulses, but i could not find pulses that fit into this (it turns out that parts from -T/2 to 0 and T to 3T/2 are always somehow narrow). I could also try by definition but that's just too much work and very time consuming, the third option is derivative theorem, but i don't know how to use it, since i never actually used it. Any help appreciated!
HINT:

It can be solved by convolution. Take two rectangles, one that is non-zero in $[-T/2,T]$ and the other being non-zero in $[0,T/2]$. Now you just have to choose the amplitudes right and the convolution of the two signals will look like the one in your question.