Verified Answer :

JL = KL
7x+4=12x-21
25 = 5x
x=5
JK = 39
KL = 39
JL = 78

apologiabiology

midpoint means the segments beside it aer equal measure
therefor
JK=KL
7x+4=12x-21
minus 7x both sides
4=5x-21
add 21 both sides
25=5x
divide oth sides by 5
5=x

LJ=2(JK)=2(KL)
find either JK or KL

7x+4
7(5)+4
35+4
39=JK

double taht
39*2=78

JL=78 units

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