Two linear expressions with a sum of -5x plus 4 are ( -5x + 4 ) and ( 4 - 5x).
6x - y
It is -9x plus 5.
3
18x + 18y - 4
4x2 -x -1 :D
-1
18x +12y = 0
14x is the sum of 5x and 9x
3x+5x
5x plus 3 does equal 3 plus 5x; commutative law.
You can add the x's together, which gives 8x+3. There is nothing else that can be done with that sum.