(x + 4) + (x + 5) = 2x + 9
(x + 4) + (x + 5) = 2x + 9
x = 15
5+x=x+5 is an example of the commutative property of addition.
Yes it does
Yes.
If its x+4x+5 then: 5x+5
x+4x+5=5x+5
x - 8 + x - 5 + x + 1 = 3x - 12
x = 5
5 + 5 + 5 - 5 + 5 + 5 - 5 + (5 x 0) = 15
x + 5 + 4 = x + 9
x + 2x + 5 = x +19 3x + 5 = x +19 3x - x = 19 - 5 2x = 14 x = 7