50*(х: 16)=40150 2700+у*400=170700 (12300-30): k=30 (a+109)*30=6510 d-(240*13)=1260 n+1240=1060*20

50•(х:16)=40150
х:16=40150:50
х:16=803
х=803•16
х=12848
2700+y•400=170700
y•400=170700-2700
y•400=168000
y=168000:400
y=420
(12300-30):k=30
12270:k=30
k=12270:30
k=409
(a+109)•30=6510
a+109=6510:30
a+109=217
a=217-109
a=108
d-(240•13)=1260
d-3120=1260
d=3120+1260
d=4380
n+1240=1060•20
n+1240=21200
n=21200-1240
n=19960