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a = aster
3sm + 4a = 100.000 ×2
2sm + 5a = 90.000 ×3
6sm+8a=200.000
6sm+15a=270.000
-7a =-70.000
a = 10.000
3sm+4a =100.000
3sm+40.000 = 100.000
3sm = 100.000-40.000
3sm =60.000
sm = 20.000