book Maths Puzzle Numerical Ability

solve - 2/3(x-5)=1+3/4(2-3x)

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book Other Question

Can you please tell me what is this called: ∈
And can you please also notifie me with some mathematical symbols

Thanks I've boggled my brain on this:

Projections from the US Department of Commerce show that the number of internet users (in millions) is approximately 11.2x-49.5, where x=0 corresp