, instead of 
, presented in step 4) of our demonstration. The real solution is 9.
by algebraic means. That is:
Given![(-4)\cdot [6+(-r)] = 12](/tpl/images/1044/8646/c5582.png)
Definition of substraction
Distributive property
/
![4\cdot r +[24+(-24)] = 12 +24](/tpl/images/1044/8646/52469.png)
Compatibility with addition/Commutative and associative properties
Existence of additive inverse/Modulative property
Compatibility with multiplication/Commutative and associative properties
Existence of multiplicative inverse/Definition of division/Result
Can someone please help me
...
Answers: 1
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