* is the same as x for multiplication. But because x is a variable it would be confusing to have both.4x+x-3-9+4*6
=4x+x-3-9+24
=5x-3-9+24
=5x+12
5x and 12 cannot be added because they are not like terms.
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no equation to simplify because there is no equal sign.
the answer to this is 4x + 57 (assuming that the 4x in the question is algebra)
4x^2 + 3
(4x + 3)(4x + 3) (4x + 3)2
4x + 16 + 1 = 4x + 17 which cannot be factorised.