Question

(d-295)*13=260
(25*(540-s)=250
t:(6000-5996)=600
(471+h):11=781

Answer 1

1. 
d-295=260:13
d-295=20
d=20+295
d=315

2.
540-s=250:25
540-s=10
s=540-10
s=530

3.
t:4=600
t=600*4
t=2400

4.
471+h=781*11
471+h=8591
h=8591-471
h=8120

Answer 2

Где?