book Maths Puzzle Numerical Ability

Can you please show me how to solve these problems?

1. x/5=-3/25
2. 7x +6=5x-24
3.-92=5t+8
4. 13-(2y+2)=2(y-2)+5y

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book Other Question

this one I have tryed to work over and over just cant seem to get it

3 + 2 = 5
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x-1 x+1 x^2-1
An object is projected upward from the top of a tower. Its distance
in feet above the ground after t seconds is given by s(t)=-16t^2+64t+80. How many seconds will it take to reach ground
level?