exam Maths Puzzle Numerical Ability

how to solve 4+X+7=48

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exam Other Question

3/x^2+4x+3 - 1/x^2-9 Determine the point A(x,y) so that the points A(x,y), B(0,3), C(1,0), D(7,2) will be a vertices of a parallelogram. Thanks for any help.