440.
46+A+24+A=70+2A=2×(35+A
25×9×b×4=900b
97×7+4×7=769+28=797
57+b+43+b=100+2b=2×(50+b)
89×6-9×6=534-54=480
72×5+28×5=360+140=500
441.
6m+m-35=21
7m=56
m=8
17n+14n-145=134
31n=279
n=9
5n+9n+32=200
14n=168
n=12
(x+57):7=12
x+57=12×7
x=84-57
x=27
(161-y):16=9
161-y=9×16
-y=144-161
-y=-17
y=17