book Maths Puzzle Numerical Ability

solve: 1/e^-x^2=(e^3x)*1/e^2

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book Other Question

1/2(x-20) - 1/5(x+15) = 1/2x - 10 - 1/5x + 3 = LCD 5/10x - 10 - 2/10x + 3 =5/10x - 10 + 10 = 2/10x + 3 + 10= 5/10x = 2/10x + 13
I get this far and am not sure how to proceed, can I really need help with this question... the point (0,1) has the distance ? from the line defined by {{{y=-2x-1}}}