book Maths Puzzle Numerical Ability

explain: -14-8+10-(-6)= ??

I get = 10 and 38

help I have trouble only with the substraction. I can do the addition, division and multiplication of positive and negative numbers. I just do not get the substraction of - / + nos.

Thanks

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book Other Question

Find the axis of symetry (X-coordinate) and vertex of the parabola y = 6 + 6x - 1/3xSQUARED. the x of 1/3x is squared I'm not sure how to get 6- the square root of 5 over 4+ the square root of 5
Could you help me? thanks!