1) 5у-72=48-3у
5у+3у=48+72
8у=120
у=120:8
у=15
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5*15-72=48-3*15
75-72=48-45
3=3
2) 53* (х-961)=3975
х-961=3975:53
х-961=75
х=75+961
х=1036
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53*(1036-961)=53*75=3975
3975=3975
3) (k+2958):87=134
k+2958 = 134*87
k+2958 =11658
k=8700
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(8700+2958):87= 11658:87=134
134=134
4) 69 + 4m = 2m +153
4m-2m=153-69
2m=84
m=42
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69+4*42=2*42+153
69+168 = 84+153
237 = 237