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