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d + m = 123
3(d − 1) = m − 2
d+m=123
3d-3=m-2
m=123-d
3d=123-d+1
4d=124
d=31
m=92
3(d − 1) = m − 2
d=123-m
3d-3=m-2 /+3
d=123-m
3d=m+1 /-m
d=123-m
3d-m=1
d=123-m
3(123-m)-m=1
d=123-m
369-3m-m=1 /-369
d=123-m
-4m=-368 /:(-4)
d=123-m
m=92
d=123-92
m=61
d=31
m=61