[tex]\displaystyle 0,8(100-0,04x)=8,64\\100-0,04x=10,8\\-0,04x=10,8-100\\-0,04x=-89,2\\x=2230[/tex]
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[tex]\displaystyle 0,8(100-0,04x)=8,64\\100-0,04x=10,8\\-0,04x=10,8-100\\-0,04x=-89,2\\x=2230[/tex]