1. 30у  20у =280; 2. 28 3х = 10;3. 1479 : (8х  5) = 29; 4. 1457 :

1. 30у 20у =
280;



2. 28 3х = 10;



3. 1479 : (8х 5) = 29;



4. 1457 : (7 + 6х) = 47;



5. m + 6m 5 = 72;



6. (24 х) + 27 = 49;



7. 7у 35 = 21;



8. 72 : (х + 3) = 12;



9. 487 + 17х = 589;



10. 138 + х + 57 = 207;



11. (28 9х) = 10;



12. (х + 15) 8 = 160; 15. 1457 : (7
+ 8х) = 47;



13. 28 (5х 11) = 12; 16. 96 : х =
12;



14. (х + 59) : 3 = 20; 17. 805 : (у +
26) = 23.