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42000\left(V_{B}-10\right)+38000V_{B}+399\left(V_{B}-9.989\right)=0
Multiply both sides of the equation by 3990000, the least common multiple of 95,105,10000.
42000V_{B}-420000+38000V_{B}+399\left(V_{B}-9.989\right)=0
Use the distributive property to multiply 42000 by V_{B}-10.
80000V_{B}-420000+399\left(V_{B}-9.989\right)=0
Combine 42000V_{B} and 38000V_{B} to get 80000V_{B}.
80000V_{B}-420000+399V_{B}-3985.611=0
Use the distributive property to multiply 399 by V_{B}-9.989.
80399V_{B}-420000-3985.611=0
Combine 80000V_{B} and 399V_{B} to get 80399V_{B}.
80399V_{B}-423985.611=0
Subtract 3985.611 from -420000 to get -423985.611.
80399V_{B}=423985.611
Add 423985.611 to both sides. Anything plus zero gives itself.
V_{B}=\frac{423985.611}{80399}
Divide both sides by 80399.
V_{B}=\frac{423985611}{80399000}
Expand \frac{423985.611}{80399} by multiplying both numerator and the denominator by 1000.