Solving $5x-1$$6x+2$$9x-3$ = 0:
Expanding the expression we get:
$5x-1$$6x+2$$9x-3$ = 0
$30x^2+10x-6x-2$$9x-3$ $30x^2+4x-3$$9x-3$ 270x^3 + 36x^2 - 90x - 12x^2 + 24x - 9
270x^3 + 24x^2 - 66x - 9 = 0

Now, factor the expression:
9$30x^3+8x^2-22x-3$ = 0

Setting each factor to zero:
30x^3 + 8x^2 - 22x - 3 = 0
This is a polynomial equation that can be solved using various methods such as factoring, synthetic division, or graphing.

Solving $x-7$$6-x$$x-1/8$ = 0:
Expanding the expression we get:
$x-7$$6-x$$x-1/8$ = 0
$x^2-x\ast 6-7x+42$$x-1/8$ $x^2-7x-6x+42$$x-1/8$ $x^2-13x+42$$x-1/8$ x^3 - x^2/8 - 13x^2 + 13x + 336x - 42

Now, factor the expression:
8$x^3-x^2-13x^2+13x+336x-42$ = 0

Setting each factor to zero:
x^3 - x^2 - 13x^2 + 13x + 336x - 42 = 0
This is a polynomial equation that can be solved using various methods such as factoring, synthetic division, or graphing.