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f(x) = 3x-7= 8
3x-7-8= 0
3x= 15
x= 15/3
b) h(-3)= -(-3) + 4= 7
h(x)= -x+4= 8
-x= 8-4
-x= 4
c) g(-3)= 1/3(-3) +5 = 4
g(x)= 1/3x +5=8
1/3x= 8-5
1/3x= 3
x= 3.3
1
x=9/1