My math question to u

4 - 6x = 8

How to use order of operation in 20 divide by 4 multiply 5 = 1

Find the domain and range of the following function f(x) = 51x - 21+ 4

Bc and bd are opposite rays. all of the following are true except a)a, b,c, d are collinear b)a, b,c, d are coplanar c)bc=bd d)b is between c and d