42-k=72:4. .b+26=70..b+13*2=70

Question

42-k=72:4. .b+26=70..b+13*2=70

Answer 1

1) 42-к=18
-к=18-42
-к=-24
к=24
2) б+26=70
б=70-26
б=44
3) б+13*2=70
б+26=70
б=70-26
б=44