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the length L of a spring is given by L=(3/4)F + 5 where F is applied force. What force F will produce a length of 8?

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L=8
F - searched force


L=(3)/(4)*F+5

8=(3)/(4)*F+5

8-5=(3)/(4)*F|*(4)/(3)

3*(4)/(3)=F
F=4
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