405-(9х+70):4=385; 1800:(240:у)-47=253 Помогите!!!!! SOS!!!!

Question

405-(9х+70):4=385;

1800:(240:у)-47=253
Помогите!!!!! SOS!!!!

Answer 1

405-(9х+70)÷4=385
-(9х+70)=(385-405)×4
-9х-70=-80
9х+70=80
9х=10
х=10/9 или 1 целая 1/9

1800÷(240÷у)-47=253
1800÷(240-у)=300
1800=300(240-у)
1800=72000-300у
300у=72000-1800
300у=70200
у=234