book Maths Puzzle Numerical Ability

how do you write x+2=1/5y in standard form

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book Other Question

do u add the exponents? solve.
a^2+ b^2
+2a^2-4b^2
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???
thanks!!!
solve for x: log2x + log2(x+2)=3

the two next to the log is a little two --
this is not from a book it is from a worksheet:)