a-105×17=2378
a-1785=2378
a=2378+1785
a=4163
58×97-a=1978
5626-a=1978
a=5626-1978
a=3648
a×9+362=443
a×9=443-362
a×9=81
a=81:9
a=9
582-7×a=533
7×a=582-533
7×a=49
a=49:7
a=7
_____________________
1000-(28:4×25)+(19×3-39)=
1000-(7×25)+(57-39)=
1000-175+18=
825+18=843
_____________________
[4×(5×12-6×5)-5×4]:10-2×(12×3-9×4)=
[4×(60-30)-20]:10-2×(36-36)=
(4×30-20):10-2×0=
(120-20):10-0=
100:10-0=
10-0=10
________________________
a-(189+43×27-9×8×4)+327×28=11002
a-(189+1161-288)+9156=11002
a-(1350-288)+9156=11002
a-1062+9156=11002
a-1062=11002-9156
a-1062=1846
a=1846+1062
a=2.908
