Помогите упростить уравнения (8c-1)*5=235 и (4n+12):8=136

8c - 1 = 235:5
8c - 1 = 47
8c = 47 + 1
8c = 48
c = 48:8
c = 6

4n + 12 = 136*8
4n + 12 = 1088
4n = 1088 - 12
4n = 1076
n = 1076:4
n = 269

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

(4n+12):8=136
4n+12=136*8
4n=1088-12
4n=1076
n=1076:4
n=269