7+x=-3Show me the way how to calculate this.

Question

I know x=-10, but I want to know the way to get there

Answer 1

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