tolong yah no 3dan 4 aja :) yg dicari nilai n nya

1)= -225:15 = -30
2)= -39 - 32 = -71
3)

3.15×n+27=-18
= 15×n=-18-27=-18+ (-27)
= -45
----------
15
n= -3
=15× (-3) +27= -18

4. 40+n-13=25
=40+n=25+13
=40+n=38
=38-40
n= -2
=40+ (-2)-13=25