Question

3/4 = 8/x-1

Answer 1

\[\frac{3}{4}=\frac{8}{x-1}\iff 3(x-1)=4\times 8\]

Answer 2

it is always that case that if \[\frac{a}{b}=\frac{c}{d}\] then \[ad=bc\]

Answer 3

or maybe it's 3/4 = 8/x -1\[\frac{3}{4}= \frac{x}{8}-1\]

Answer 4

maybe, but i doubt it