I know x=-10, but I want to know the way to get there
For algebra problems like this, we want to modify the equations that are given, such that we end up with an equation that looks like "x = ________", which will tell us the value of x.
We can do anything we want to any equation (add something, subtract something, multiply/divide, etc.), as long as we do the same thing to both sides.
In this case, we have
7 + x = -3
Since we want to get x all by itself on one side of the equation, we have to figure out how to "undo" the 7 that is being added to it. So, we will subtract 7 from both sides of the equation:
7 + x = -3
-7 -7
7 - 7 + x = -3 - 7
On the left, the 7 - 7 cancels to 0
x = -3 - 7
x = -10
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