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f3= 55-30= 15N
15+40 = 55
karena 55N -55N = 0
perumpamaan
ke kiri = -
ke kanan = +
F = F1 + F2 + F3 + F4 + F5 = 0
= -10 - 20 + f3 + 15 + 40 = 0
= - 30 + F3 + 55 = 0
F3 = - 55 + 30
= l-25l
= 25
berarti arah ke kiri
Semoga membantu :) D like