2
1)5t+11=7t+31
7t-5t=11-31
2t=-20
t=-10
2)8t+3=3(5t-6)
8t+3=15t-18
15t-8t=3+18
3t=21
t=7
3)2(5t+1)=10t+18
10t+2=10t-18
10t-10t=-18-2
0t=-20
Нет решения
4)(0,25t-31)-(0,25t-18)=5
0,25t-31-0,25t=5+31-18
0t=18
Нет решения
5)(12t+11)-(13t-7)=8
12t-13t=8-11-7
-t=-10
t=10
6)(1,5t-37)-(1,5t-73)=36
1,5t-1,5t=36+37-73
0t=0
t∈(-∞;∞)
3
a)5x+7x+11x=8-15+3+4
23x=0
x=0
б)4x-10x+4x=7+13-3+11
-2x=28
x=-14
в)-5x+4x+5x=8-7+8-6
4x=3
x=0,75
г)-2x-3x-5x-7x=12-3-4-5
-17x=0
x=0
4
19(2x-3)=19(5x+6)
(2x-3)/11=(5x+6)/11
x=-3
5
3x+7=3x+11
5-x=6-x
/x/+1=0