exam Maths Puzzle Numerical Ability

Please help solving this rational equation:

2- (x-1)/(x+3)=(x-3)/(x-4)

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exam Other Question

Rewrite each equation as a function of x.
-3x+4y+11

McGraw Hill 6th edtion, chapter 7.5 exercise #18
Thanks for your time!!!! Hi!
I have a question about solving systems using inverse matrix.

(x) (-2 1) (8) (-10)
(y) STEP1 = (3/2 -1/2) (6) STEP2 = ( 9) STEP3

How to get from step 2 to step 3?

Thanks!
Anna