Without an equality sign the expession given is not an equation.
But if you mean 8 = 42x then the value od x is 8/42
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If you mean: -2(3x-3) = 7x-2 then the value of x works out as 8/13
-8 + 7x = x - 506x = -42x = -6
x2 - 42x + 441 = (x - 21)2
you just equal that equation to 0, then you solve for x 5x-8=0 5x=8 x=8/5
x3 + 13x2 + 42x = x(x + 6)(x + 7).