How do i get 28 and 13 gallons to 17 gallons i really need help with it as soon as i can

the answer for this question is 38

step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2

1) 2/5

2) zero=0/1

3) zero=0/2

4) -4/5

5) undefined=3/0