i-component: 2 - 3t = -1 + 5s => 5s + 3t = 3.
j-component: 3t = 3 - 5s => 3t + 5s = 3.
These two equations are the same.
k-component: 1 + 3t = 5s => 5s - 3t = 1 => 3t - 5s = -1.
There's no trouble here ..... Just solve 5s + 3t = 3 and 3t - 5s = -1 simultaneously for t (or s, or both if you want to check the answer).