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15) 4x=-53.2. d=-1.1
16) a.--1191, d =-90
17) 0
= 249, d = 8
18) a = -276, d = -7
![15 4x532 D11 16 A1191 D 90 17 0 249 D 8 18 A 276 D 7 class=](https://us-static.z-dn.net/files/dd0/979d1e21bb3a906a0ed78e787867335e.png)