saya mohon pakai cara dan termakasih bantuannya

jawabannya x = 6
cara :
12/12+x=8/12
12 x 3 =2(12 + x)
36 = 24 + 2x
36-24 = 2x
12 = 2x
x = 12/2
x= 6

=(8/12)x(12/12+x)
=(8.(12+x)=12.12
=96+x=144
=x=144-96=48
Semoga membantu^_^