6x + 4
just add like terms, (5x can be multiplyed by 4 but NOT added because 4 doesn't have an x) 5x + x or 5x+1x=6x and you would have positive 4 left over or +4 so the answer would be 6x+4 ps. that was along answer for something so simple, hope I didn't end up confusing you more :/
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2x + 7 + 5x - 4 - x = (2x + 5x - x) + (7 - 4) = 6x + 3
5x + 2 = x + 12 5x - x = 12 - 2 4x = 10 x = 10/4 x = 5/2 or 2.5
If you mean: x^2 +5x +4 then it is (x+4)(x+1) when factored
The factors of x2 + 5x + 4 would be (x + 1) and (x + 4)
(x+1)(x+4)