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y =2x-7
2x = y+7
x = y+7/2
g invers (x) = x+7/2 (d)
20) f(x)=2/5x
y =2/5x
2/5x=y
2x = 5.y
2x = 5y
x = 5/2 y
f invers (x)= 5/2x
f invers(-2) = 5/2 . (-2)= -5 (e)