book Maths Puzzle Numerical Ability

Write this expression in simplest form.

4x - 28/5x - 35

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book Other Question

Find an equation of the line (in either general form or slope intercept form) that contains the centers of the following two circles:

x^2+y^2-4x+6y+4 = 0 and x^2+y^2+6x+4y+9 = 0 i need the Final answer to nearest tenth. but i not sure how to do this problem, can anyone help?

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