Hi I am new to R so am struggling with the commands here

I have one column in a table that looks like


slope (60/25/15) 
slope (90/10) 
slope (40/35/15/10) 
slope (40/25/25/10) 
I want to have 4 columns with just the number inside the parenthesis. when there is no number that cell can have 0. I want the output like this

60 25 15 0
90 10 0 0
40 35 15 10
40 25 25 10

Can somebody help me??
Thanks
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