According to the axis
L−E= L-E= L−E=
BBB-5-5-5CCC-4-4-4DDD-3-3-3EEE-2-2-2FFF-1-1-1GGG000HHH111III222JJJ333KKK444LLL555MMM666AAA-6-6-6
We will locate on the number line the letters and place accordingly:
L=5 L=5 L=5
E=−2 E=-2 E=−2
Therefore:
5−(−2)= 5-(-2)= 5−(−2)=
We recall the rule:
−(−x)=+x -(-x)=+x −(−x)=+x
Now we get:
5+2=7 5+2=7 5+2=7
7