Offsetting time and position of several layers relative to preceding layer

hello -

 

pardon newbie questions, i've keyframed 'black solid' moving along x axis , duplicate layer (perhaps new color) several times each 'new layer' follows previous layer , offsets amount of pixels...say 20px example.

 

i found simple expression applied first dup'd layer , works fine can't figure out tell offset 20px left of main layer.

 

thiscomp.layer("black solid 1").transform.position.valueattime(time -.1);

 

i suppose i'm trying cascading effect + offset.

 

thanks!

gj

like this:

 

thiscomp.layer("black solid 1").transform.position.valueattime(time -.1) - [20,0];

 

 

dan

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