Answer:
1. x=12
2. x=5
3. x= 15
Step-by-step explanation:
Sulotion 1.
{9×20= x× 15
{x≠0
{20≠0
{180×15x
{x≠0
{20≠0
(x=12 answer)
sulotion 2
[tex]x \times 18 = 6 \times 15 \\ \\ 18x = 6 \times 15 \\ \\ 18x = 90 \\ \\ answer \: x = 5[/tex]
sulotion 3
[tex]x + 3 = 18 \\ \\ x = 18 - 3 \\ x = 15[/tex]