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umur Sinta skrg=y
*3 tahun lalu*
(x-3)=8(y-3)
x-3=8y-24
x-8y=-21
x=-21+8y.....(1)
*12 tahun lalu*
(x+12)=3(y+12)
x+12=3y+36
x-3y=24
x=24+3y......(2)
substitusikan persmaan (1) ke persamaan (2)
-21+8y=24+3y
5y=45
y=9 tahun
maka x=-21+8(9)=-21+72=51 tahun