3 more than X is nearly always expressed as X+3, except in some atypical number systems, which is too complicated for this Answers forum. Just go with X+3.
x + 3
(x+y)+3
6x2-5x-6
The algebraic expression for "3 more than a number" can be written as x + 3, where x represents the unknown number. In this expression, the variable x is being increased by 3. This expression can be simplified further if needed, but the basic form is x + 3.
(75/3)+6 = X 25 + 6 = X 31 = X
x + 3
X+3
(x+y)+3
6 x 3 + 2 = 20
6x2-5x-6
Three less than twice x is 2x-3.Two more than the quantity 3 times x is 3x + 2.The product of these is (2x-3)(3x+2), which can also be written as:(6x2 - 5x - 6)
Three less than twice x is 2x-3.Two more than the quantity 3 times x is 3x + 2.The product of these is (2x-3)(3x+2), which can also be written as:(6x2 - 5x - 6)
(75/3)+6 = X 25 + 6 = X 31 = X
If X is the variable, then X/(-12+9) = x/(-3) = -X/3
423 is a composite number because it has more factors than one and itself. Its prime factorisation is 3 x 3 x 47.
y = 3 + (-x) or y = 3 - x
(2x)+3