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let a=3x-1, b=2x+1, c=2x
a+b+c
(3x-1)+(2x+2)+(2x)
3x-1+2x+2+2x
3x+2x+2x=(-1)+2
7x=1
x=1/7
also,
a=3x-1= 3(1/7)-1= -4/7
b=2x+1= 2(1/7)+2=16/7
c=2x= 2(1/7) =2/7
perimeter of triangle= a+b+c
= (-4/7)+(16/7)+(2/7)
= 14/7
= 2 units
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