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2a+b=5
b=1
jadi b=1, maskukan b ke 2a+b=5
2a+1=5
2a=4
a=2
jadi f(x)=2x+1
f(-10)= (2.-10)+1
-20+1=-19
jadi f(-10)= -19
nanti hasilnya akan ktemu...
f(-10) = -19