book Maths Puzzle Numerical Ability

simplify: x^2-6x+8/x^2+3x-28 * x^2+6x-7/x^2-3x+2

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USE THE SUBSTITUTION METHOD TO SOLVE THE LINEAR SYSTEM

1. X + 2 = -5
4x -3y = 2


2. 3x - 2y =4
x + 3y = 5


3. 3x + y = -2
x + 3y = 2
how do your simplify an expression like this one 4+6(8)??