exam Maths Puzzle Numerical Ability

Could you please help me solve this problem?
-10(8x+1)+8(10x+1)=x-9

= 80x+10+80x+8=x-9
= 70x + 88x =x-9

I am stuck here?

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exam Other Question

I have been working on this problem for about an hour. I am ready to toss it out the window!
1) Let f(x) compute the time in hours to travel x miles at 58 miles per hour.
2)What does f-1(x) compute?

Thanks so much. Noel weighs 65 kg and Tommy weighs 80 kg. If Noel sits 1 meter from the fulcrum of the seesaw and Tommy sits 1.5 meters from the fulcrum,where should Randy sit, if he weighs 70 kg,