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Output force of lever-crank mechanism

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Hi guys.

Am new here and was just looking for a bit of advice on how I would go about solving the above (more information can be provided as needed, sorry for the poor quality of image!). In the sketch, points a & b are fixed pivot points and x, y & z are movable pivot points, Fi is 100N and I want to find output force Ff.

I am designing a clamp system and need to work out how much force will be output through the mechanism with a specified input linear force. I have done such calculations in the past but I cannot for the life of me remember where to even begin with this one!

I know it is probably much more simple than I am making it for myself so I was hoping the clever people on here could help me out.

Thanks in advance!