exam Maths Puzzle Numerical Ability

i do not know how to solve
6e^-1.4x=21

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exam Other Question

Please help me to solve following
(n-1)
E [(n-m+1)(n-m) + (n-m)]
(m=1)
I am using E for sigma sign.

B. Chakraborty Subtract.

1.
5x/x-1 MINUS 5/x-1

2.
2x squared/x-4 MINUS 32/x-4