a+(8×5)=6×7+36:4
a+40=42+9
a+40=51
a=51-40
a=11
(8×4)+a=6×9+16:2
32+a=54+8
32+a=62
a=62-32
a=30
b+(5×5)=63:9+4×7
b+25=7+28
b+25=35
b=35-25
b=10
a-(9×8)=(32:4)+225
a-72=8+225
a-72=233
a=233+72
a=305
c-(6×3)=126+(7×5)+27:3
c-18=126+35+9
c-18=170
c=170+18
c=188
(7×8)-d=92-10×5
56-d=92-50
56-d=42
d=56-42
d=14