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Verified answer

144:(х-3)=36
x-3=144/36
x-3=4
x=4+3
x=7

21×(у-8)=84
21y-168=84
21y=84+168
21y=252
y=12

(х+67):18=4
x+67=4*18
x+67=72
x=72-67
x=5

(19n-6n):4=26;
13n=26*4
13n=104
n=104/13
n= 8

(16m+5m):18=7;
21m=18*7
21m=126
m= 6

(17n-8n)×13=351
9n=351/13
9n=27
n=3