book Maths Puzzle Numerical Ability

2x x 34 = 40.what is x?

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book Other Question

From a square piece of cardboard with width x inches, a square of
width x − 3 inches is removed from the center. Write the area of
the remaining piece as a function of x.
please help me with this question.
solve bu any method.
-2x+2y=6
3x-y=3