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-5=6-b
b=11
f(7)=3x7-11
f(7)=21-11
f(7)=10
di cek dulu .......
f(2) = -5
f(7) =....??
cari b nya dulu
f(x) = 3x-b
berarti
f(2) = 3(2)-b = -5
= 6 -b = -5
= -b = -5-6
b = 11
f(7) = 3(7)-11
= 21 - 11
= 10