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If you mean: -2(3x-3) = 7x-2 then the value of x works out as 8/13
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
x2 - 42x + 441 = (x - 21)2
x3 + 13x2 + 42x = x(x + 6)(x + 7).
126 ._.