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Np dp - W (1/2 L - x) = 0
Np 2 - 300 (1/2 4 - 0,5) = 0
2 Np - 300 (2 - 0,5) = 0
2 Np - 300 1,5 = 0
2 Np - 450 = 0
2 Np = 450
Np = 225 Newton
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