Answer:
6 it is 6
Step-by-step explanation:
QUESTION → 
Start by subtracting 3 from both sides to get
.
Now multiply both sides by the reciprocal of 3/2, which is 2/3.
On the left, we have x, and on the right, -3(2/3) is -2.
So we have x = -2.
7y + 10x = 99
y - x = 2
y = 7 , x = 5