[t+2s]=s-3

Solution for [t+2s]=s-3 equation:

Simplifying
[t + 2s] = s + -3

Reorder the terms:
[2s + t] = s + -3

Remove brackets around [2s + t]
2s + t = s + -3

Reorder the terms:
2s + t = -3 + s

Solving
2s + t = -3 + s

Solving for variable 's'.

Move all terms containing s to the left, all other terms to the right.

Add '-1s' to each side of the equation.
2s + -1s + t = -3 + s + -1s

Combine like terms: 2s + -1s = 1s
1s + t = -3 + s + -1s

Combine like terms: s + -1s = 0
1s + t = -3 + 0
1s + t = -3

Add '-1t' to each side of the equation.
1s + t + -1t = -3 + -1t

Combine like terms: t + -1t = 0
1s + 0 = -3 + -1t
1s = -3 + -1t

Divide each side by '1'.
s = -3 + -1t

Simplifying
s = -3 + -1t