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4s+2t=200 x3
---------------------
12s+20t=1.160
12s+ 6t = 600
--------------------- -
14t=560
t=40
4s+2t=200
4s+2(40)=200
4s+80=200
4s=200-80
4s=120
s=30
Jadi, 3s+2t=3(30)+2(40)
=90+80
=170.000
4s+2t=200.000 (x3)
12s+20t=1.160.000
12s+6t=600.000 eliminasi
14t=560.000
t=40.000
4s+2t=200.000
4s+2(40.000)=200.000
4s+80.000=200.000
4s=200.000 - 80.000
4s=120.000
s=30.000
3s+2t
3(30.000) + 2(40.000)
90.000 + 80.000
170.000
semoga bermanfaat :)