exam Maths Puzzle Numerical Ability

7+3x=5x-5

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exam Other Question

find the sum of the geometric series
6
[SUM] 2^n
n=1

n=1 2^1=2
n=2 2^2=4
n=3 2^3=8
n=4 2^4=16
n=5 2^5=32
n=6 2^6=64
2+4+8+16+32+64= 126

am I doing this correctly? Solve the following equation for x.

185.45=32.1e^1.23x