Решите уравнения: 5a = -a-13 ; 6-4у=у+3 ; 9х = 8х-6; -5 (z-7) = 30 - (2z+1).

Question

Решите уравнения: 5a = -a-13 ; 6-4у=у+3 ; 9х = 8х-6; -5 (z-7) = 30 - (2z+1).

Answer 1

5a = -a-13
5а+а=-13
6а=-13
а=-13/6
а=-2 1/6

6-4у=у+3
6-3=у+4у
5у=3
у=3/5

9х = 8х-6
9х-8х=-6
х=-6

-5 (z-7) = 30 - (2z+1)
-5z+35 = 30-2z-1
35-29=-2z+5z
3z=6
z=2