need help with algebra 1 hmw!!!

Question

the cost of c of going to the amusement park is the $5 admission cost plus $1.50 times the number of rides taken, r. Solve for r.

Answer 1

c=5+1.5r

1.5r = c-5

r = (c-5)/1.5

or

r= 2(c-5)/3

or

r= 2c/3 - 10/3