You can't simplify it any further than
3x+2y+6z=24, unless you have been given values of x,y and z or other equations to find x,y and z.
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6x-2y
(3, 3)
x + 2y - 9 = 4 can be rewritten as x + 2y = 13, but this is as far as you can simplify it because you have two unknowns and one equation.
the answer to this problem is -2x^2y^2
This means that 2y - 3 = 2y + 4 which is not possible.