0,8*0,03*x+0,8*0,035*(12000-x) = 300
0,024x+0,028* (12000-x) = 300
0,024x+336-0,028x=300
0,024x-0,028x=300-336
-0,004x=-36 / : (-0,004)
x=9000
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0,8*0,03*x+0,8*0,035*(12000-x) = 300
0,024x+0,028* (12000-x) = 300
0,024x+336-0,028x=300
0,024x-0,028x=300-336
-0,004x=-36 / : (-0,004)
x=9000