book Maths Puzzle Numerical Ability

PLEASE HELP ME WITH THIS EQUATION.

2/5+4/10X+5=7/2X+1

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These are so difficult for me and I have over 75 to do. Can someone help me? Thank you!

This is a hard one!!!!

must solve and show work

x(x-3) + 4x-3 = 8x + x(3+x) a tangent to a circle ______ the radius drawn to the point of tangency.