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3a-18=2b-12
3a-2b=6.......(1)
(a+3)+(b+3)=78
a+b=72
b=72-a..........(2)
substitusi persmaan 2 →1
maka:
3a-2b=6
3a-2 (72-a)=6
3a-144+2a=6
5a=150
a=30
umur a skrg adlh 30 thun
maka umur a 2 thun yg lalu adlh 30-2=28 thun
jdikn yg terbaik y
:)