Question

D=ABC.....SOLVE B

Answer 1

D = ABC for B
divide both sides by AC
D/AC = ABC/AC
D/AC = B

Answer 2

In such a equation, where there are no possible ways to find the actual values of the variables, you are simply isolating the variable that it is asking for (B in this instance).

Dividing each side by A and C to isolate B, we get that \[\frac{ D }{ AC } = B\]