We are given an equation here:

Step 1:
Find the value of x, solving the given equation

Here 6 is in addition of left side, so we apply opposite operation of addition, subtracting 6 from right side,


Here 5 is in multiplication on left side, so dividing right side by 5,
x= 4/5
Step 2:
Plug the value of x in the expression 10x+3.
So replacing x by 4/5 in the given expression we have,

=11
Answer: option third, 11