Good morning
(x-3)(2y+1)=13
Now let's start by adding 3 to both sides
2xy+x-6y-3+3=13+3
2xy+x-6y=16
Now we need to add 6y to both sides
2xy+x=6y+16
2xy+x=6y+16
Now let's factor out the variable x
x(2y+1)=6y+16
Now we gonna have to divide both sides by 2x+1 so we can find the value for x
x(2y+1)/2y+1= 6y+16/2y+1
x= 6y+16/2y+1
I hope that's help :)