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a.x=-1
g(-1)=-5(-1)+1
-g=5+1
-g=6
g=-6
b.g(x)=-14
-14=-5x+1
-14+5x-1=0
5x-15=0
5x=15
x=3
c.g(x)--->g(a)=21
21=-5x+1
21+5x-1=0
5x+20=0
5x=-20
x=-4