Question

(8c - 1) *5 =235

(4n + 12 ) : 8 = 136

Answer 1

8с - 1 = 47 ( 235 : 5 )
8с = 47 + 1
8с = 48 ( 48 : 8 )
с = 6

Answer 2

(4n+12):8=136
4n=136:8
4n=18
n=18+12
n=30
n=30:6
n=5