(y+2958): 57=139
у+2958=139*57
у+2958=7923
у=7923-2958
у=4965
42172-5*x=7152
-5х=7152-42172
-5х=-35020
х=-35020:-5
х=7004
(y+3698):507=630
y+3698=630*507
y+3698=319410
у=315712
26 176 : (y*56-45856)=409
26176:409=56у-45856
64=56у
45856+64=56у
45920=56у
45920: 56=у
820=у