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2a+3b=2700 (x5)
------------------(-)
10a+4b=8000
10a+15b=13500
--------------------- (-)
-11b=-5500
b=-5500/-11
b=500
5a+2b=4000
5a+2(500)=4000
5a+1000=4000
5a=4000-1000
5a=3000
a=3000/5
a= 600
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