Numerators will be equal after the multiplication.
5u - (-20u) - u - 18u + (-11u) = 10
5u + 20u - u - 18u - 11u = 10
-5u = 10
-5(-2) = 10
So, in conclusion, X, is equal to -2.
The Number is 79500, since the nearest thousand for 79500 is 80000
300 - 30 3/10 = 269 7/10
hope this helps