If you skip to the very bottom of this force problem you find two equations. In a rectangle called step (2) it says; Sub in T3 in symbols; Solve for T2.
The circled variables are unknowns.
How do I solve this when both T2 and T3 are unknowns? By the way, T1 is 25.
This is as far as I get. Thanks.
T2 sin40 + T3 sin30 =T1
T2 sin40 =T1 - T3 sin30
T2 sin40 =25 - T3 sin30