Question

Make u the subject of the formula.
5u + 13 = 7t – 2ut

Answer 1

u = 6t-13/3

-2u of both sides
3u + 13 = 7t - t
which is actually
3u + 13 = 6t
-13
3u = 6t - 13
divided by 3
u = 6t-13/3