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(a) = -2a + 3 = -7
= 7 + 3 = 2a
= 10 = 2a
= 5 = a
f(-2) = -2(-2) + 3
= 4 + 3
= 7
f(3) = -2(3) +3
= -6 + 3
= -3
maaf kalo salah..
-2x=7-3
-2x=4
x= 4:-2
x=-2
a= -2