17n+14n-145=134
31n=134+145
n=279/31
n=9
5n+9n+32=200
14n=200-32
n=168/14
n=12
(x+57)/7=12
x+57=12*7
x=84-57
x=27
(161-y)/16=9
y=9*16-161
y=-17
112/(17+x)=4
17+x=112/4
x=28-17
x=11
(50-14)-16=20
<span>(7 • 63) : 7=63
</span>(21+27):3=16
Х*(1-0,57)=3,44
х*0,43=3,44
0,43х=3,44
х=3,44:0,43
х=8
(33,74-51:25):7=(33,74-2,04):7=31,7:7=4,5285714286