Tentukan variabel dari persamaan persamaan di bawah ini

c.
3(2z -1) + 1 = -2(2z + 9)
6z - 3 + 1 = -4z - 18
6z - 2 = -4z - 18
6z + 4z = -18 + 2
10z = -16
z = [tex] \displaystyle \frac{-16}{10} [/tex]
z = -[tex] \displaystyle \frac{8}{5} [/tex]

d.
-(4n - 4) + 5n = 2n + 8
-4n + 4 + 5n = 2n + 8
-4n - 2n + 5n = 8 - 4
-n = 4
n = -4

e.
20(3x + 1) = -50(5 - x)
60x + 20 = -250 + 50x
60x - 50x = -250 - 20
10x = -270
x = [tex] \displaystyle \frac{-270}{10} [/tex]
x = -27

f.
2c - 5(c - 1) = 7 - 2c
2c - 5c + 5 = 7 - 2c
2c + 2c - 5c = 7 - 5
-c = 2
c = -2

j.
2(2b - 4) - 3b = 8 - 4(2 - 0,5b)
4b - 8 - 3b = 8 - 8 + 2b
4b - 3b - 2b = 8 - 8 + 8
-b = 8
b = -8