exam Maths Puzzle Numerical Ability

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,

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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? Solving Linear Inequalities: Can you help me with this? The question is, Solve each simple linear inequality. Graph each solution on the number line provided. Example: 6x + 7 > 11 <------------>. ? How do I solve this problem? Thanks, JT.