x is invested in CD's @ 7%, then we have:
(190,000 - x) is invested in AA bonds. But, we have:
.07x + .10(190,000-x)=17,200
.07x + 19,000 - .1x=17,200
-.03x=-1,800
x=$60,000 is to be invested in CD's @ 7%, and $ $190,000-$60,000
=$130,000 is to be invested in AA bonds @ 10%