A.
[tex](4a+12^{2}):46 = 12\\\\4a+144 = 12\cdot46\\\\4a = 552-144\\\\4a = 408 \ \ /:4\\\\a = 102[/tex]
B.
[tex]31-c=4^{2}\\\\-3c = 16-31\\\\-3c = -15 \ \ /:(-3)\\\\\underline{c = 5}[/tex]
C.
[tex](3d+18):7 = 6\\\\3d+18 = 6\cdot7\\\\3d = 42-18\\\\3d = 24 \ \ /:3\\\\d = 8[/tex]
D.
[tex]2(4a-3^{2}) = 22 \ \ /:2\\\\4a-3^{2} = 11\\\\4a-9 = 11\\\\4a=11+9\\\\4a = 20 \ \ /:4\\\\\underline{a = 5}[/tex]
Odp. B i D.
