5×(28+x)=200

x×64+2176=6272

12307-x÷124=11932

100÷x+15=35

5×(28+х)=200 100÷х+15=35
28+х=200:5 100÷x=35-15
28+х=40 100÷x=20
х=40-28=12 х=100÷20
х=5
х×64+2176=6272
х×64=6272-2176
х×64=4096
х=4096÷64
х =64

12307-х÷124=11932
х÷124=12307-11932
х÷124=372
х=372÷124
х=3

5× (28+ x) = 200
140+ 5x=200
5x=200-140
5x=60
x=60:5
x=12


x×64+2176=6272
x×64=6272-2176
x×64=4096
x=4096:64
x=64


12307-x:124=11932
-x:124= 11932-12307
-x:124=-375
-x=-375×124
x=46500



100:x+15=35
100:x=35-15
100:x=20
x=100:20
x=5