In order to find b you need to isolate it on one side of the equation.
To do this you perform the same operations on both side of the equation.
18 - b = 4
To get -b on it's own subtract 18 from both sides
-b = 14
To get +b multiply both sides by -1 to get rid of the negative sign on the b
b = -14
If: 9a = 18b Then: a = 2b
The GCF is 6b.
18b+9=9(b+2)
18b+9 = 9(b+2)
simplify the ratio 18b^2 to 45b
18b and 24b are both divisible by 6 and they both have b so its 6b
6a plus 18b = 24
-16
It is "a squared minus eighteen b".
The GCF is 6.
40
4+4 equals 8.