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\[7x + 2(3-x) = x - (3^{2} - 2^{3} ) \]

your first job is to compute \(3^3-2^3\)
what is that number?

9-4=5

it is really \(3^2-2^3\) or is it \(3^2-2^2\) ?

the second one is \(3^2-2^2=9-4=5\) but if it is \(3^2-2^3\) then you get
\[3^2-2^3=9-8=1\]

How will we know which one?