# How do you solve  -4 = -1+x?

This is an equation and the idea is to find the value of $x$ that makes the right side equal (equation) to the left one. To do that try to ISOLATE $x$ on one side and send the numbers to the other side of the $=$ sign. Remember that every time a term "crosses" the $=$ sign it changes sign!
So: take $- 1$ and send it to the left (changing sign):
$- 4 + 1 = x$
evaluate $- 4 + 1$
$- 3 = x$
So, finally, you got that the value of $x$ that satisfies your equation is $- 3$!
If you substitute $- 3$ in your equation in place of $x$, you'll get:
$- 4 = - 1 \textcolor{red}{- 3}$ which is true.