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maka f(x)=2x-3
3=2a-3
2a=3+3
2a=6
a=6/2
a=3
(b,-5)⇒x=b,y=-5maka f(x)=2x-3
-5=2b-3
2b=-5+3
2b=-2
b=-2/2
b=-1
(-2,c)⇒x=-2,y=cmaka f(x)=2x-3
c=2(-2)-3
c=-4-3
c=-7
(-1,d)}⇒x=-1,y=dmaka f(x)=2x-3
d=2(-1)-3
d=-2-3
d=-5
nilai a+b+c-d =3+-1+-7+-5=-10