we need to know the =
5x + 4 = ????? cant solve for x without the = ???
with what you gave me the answer could be 500,000,004
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5X + 9 5(3) + 9 15 + 9 = 24 ====
It is 5x - 4
If -4 + 5x = 6, 5x = 6 +4 = 10 or x = 2.
If you mean: x^2 +5x +4 then it is (x+4)(x+1) when factored
2x + 7 + 5x - 4 - x = (2x + 5x - x) + (7 - 4) = 6x + 3