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Verified answer
Diketahui:u7= 10
u13= -2
ditanya: u56....?
jawab:
b= u13-u7/13-7
b= -2-10/6
b= -12/6
b= -2
u56= u13+43b
u56= -2+43(-2)
u56= -2+(-86)
u56= -88