book Maths Puzzle Numerical Ability

what is x and how do you do it
1/2x+1/3x=8
yahnk you soooooooooooooooooooooooooooooooooo much

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book Other Question

Combine terms:
10-5b/3+10b Please show me how to work this.
x+5/-1

What values for x must be excluded? The answer is none, but I cant figure it out!