Question

a)3x – 21 = 0
b)18 – x =7

c)4x + 3 = – 19
c)5 – x =– 4​

Answer 1

a) 3x - 21 = 0

3x = 21

x = 21/3

x = 7

b) 18 - x = 7

-x = 7 - 18

-x = -11 (.-1)

x = 11

c) 4x + 3 = -19

4x = -19 - 3

4x = -22

x = - 22/4

x = - 11/2 = -5,5

d) 5 - x = -4

-x = -4 - 5

-x = -9 (.-1)

x = 9