7x+2y+1=0

To solve the equation 7x + 2y + 1 = 0, we need to isolate one variable. First, let's isolate x:

7x = -2y - 1

Now, divide both sides of the equation by 7:

x = (-2y - 1) / 7

So the equation is written as x = (-2y - 1) / 7.