The first equation shows:
+ + = 30Since the three puppies are identical:
30 ÷ 3 = 10
So:
= 10
The second equation is:
+ 
+ = 20Substitute the puppy’s value:
10 + + = 20Subtract 10 from both sides:
+ = 10Divide by 2:
= 5
The third equation says:
− = 5Using the values we found:
5 − 10 = -5
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