We know that perimeter of the triangle its a+b+c=25
a=2b-2
b=b
c=b+3
Now we can substitute it into the formula
2b-2+b+b+3=25
4b+1=25 /-1
4b=24 /:4
b=6 - its b side
a=2*6-2
a=12-2=10 - its a side
c=6+3=9 - its c side
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