Question

three sides of a triangle measure {5x-2} units,{4x+5} units and 3x units find the measure of the sides if its perimeter is 171 units

Answer 1

perimeter of triangle = a+ b+ c =171
                             = 5x-2+4x+5+3x=171
                             = 12x + 3 = 171
                             = 12x=168
                             = x=14
a=68,b=61,c=42

Answer 2

perimeter of a triangle=a+b+c=171
5x-2+4x+5+3x=171
12x+3=171
12x=168
x=14
so 
a=5x-2=5.14-2=70-2=68
b=4x+5=4.14+5=56+5=61
c=3x=3.14=42