Solve for x.

3/7x−4=−1

To solve for x, we need to isolate x on one side of the equation.

First, add 4 to both sides to get rid of the -4 on the left side of the equation:

3/7x = 3

Next, multiply both sides by 7 to get rid of the fraction:

7 * (3/7x) = 7 * 3
3x = 21

Finally, divide by 3 on both sides to solve for x:

x = 21/3
x = 7

Therefore, x = 7.