book Maths Puzzle Numerical Ability

Please help me solve these two problems.

1. 9(t-1)=(t+4)-t



2. 40-8s/5=-2s

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how would i work this problem out :3x-y=1 Walt and Gail left a stable for a ride to a mountain lookout. On the way up, they averaged 3 mi/h. On the way back along the same trail, they averaged 5 1/4 mi/h, and the return tr