Question

X - - 3 = 10

What is the value of x?

Answer 1

x=7

Explanation:

First, you start with keep, change, change. Keep the x, change the minus to a plus, and then make the negative 3 into three.

So you should have X+3=10

Take the 10 and minus 3

Then you have 7

So your answer will be X=7

Answer 2

x = 7

Explanation:

Rule: an even number of - signs written one after another produces a plus number.

So - - 3 = 3

The rule also lets you do something strange like

- - - - 4 = 4 but you hardly ever see this.

Rule: an odd number of minus signs produces a minus number.

x + 3 = 10 Subtract 3 from both sides.

x + 3 - 3 = 10 - 3

x = 7