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F(3)= ax+b=c
3a+b=7(3)-4
3a+b=17
F(-4)= -4a+b=7(-4)-4
-4a+b=-32
3a+b=17
-4a+b=-32
________ -
7a=49
a=7
3a+b=17
3(7)+b=17
b=17-21
b=-4
Sisa pembagiannya (7x-4)