Question

(х+115)-35=145
168-(98+z)=65
(853+у)-53=900
(s+275)-275=384

Answer 1

1)х+115-35=145
х=145-115+35
х=65
2)168-98-z=65
z=5
3)853+у-53=900
у=100
4)s+275-275=384
s=384