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f(x)=-4x - m dan f(-3)=-7
maka
-7=-4(-3)-m
-7=12-m
m=12+7=19
sehingga
5f(1) - 25 = 4x - m
5f(1)=4x1-19+25
5f(1)=-15+25
5f(1)=10
f(1)=2