book Maths Puzzle Numerical Ability

3x^2+x=2x-6

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book Other Question

The center of a circle is C(-3,1) and a point on the circle is P(5,-7). The length of the diameter is ___
A. 22.6
B. 11.3
C. 12.8
D. 6.4

HELP! how would you do 2/3+ 1/4- 1/5 bc i had a problem but it wasn't the same as this one it was almost like it but i didn't know how to do it and i was never showed how to after i got