1. Start with the equation:
561-(t+154)=137
2. Distribute the negative sign:
561-t-154=137
3. Simplify the left side by combining like terms:
407-t=137
4. Subtract 407 from both sides:
-t=137-407
5. Simplify the right side:
-t=-270
6. Multiply both sides by -1:
t=270
Answer: t = 270