Answer:
0
Step-by-step explanation:
x=\frac{q-n}{3G};\quad \:b\ne \:0
bn+3xGb=qb
bn+3xGb-bn=qb-bn
3bn+3xGb-bn=qb-bn
\frac{3xGb}{3Gb}=\frac{qb}{3Gb}-\frac{bn}{3Gb};\quad \:b\ne \:0