Answer:
x = -1/2
Explanation:
3xy + 5x + 2 + 3y + x +4 -> 3x + 5x + 2 + 3x + x + 4 = 0
We add all the numbers together, and all the variables
12x+6=0
We move all terms containing x to the left, all other terms to the right
12x=-6
x=-6/12
x=-1/2
(remember, there should only be one variable)