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pensil=b
5a+4b=30.000 x2 10a+8b=60.000
2a+6b=23.000 x5 10a+30b=115.000
-22b=-55000
b=-55.000/-22=2500
sub
2a+4b= 23.000
2a+ 4.2500=23000
2a=23000-10000
2a=13000
a=13000/2= 6500
jd 3a+2b= 3(6500)+2(2500)=19500+5000=24.500