Answer: 11
Step-by-step explanation:
The given equation : [tex]12+(7+m)=30[/tex] (1)
Using Associative property of addition :
[tex]a+(b +c)=(a+b)+c[/tex]
We have,
[tex]12+(7+m)=(12+7)+m=19+m[/tex] (2)
From equation (2) and (1), we get
[tex]19+m=30[/tex]
Using Subtraction property of equality, subtract 19 from both sides, we get
[tex]m=30-19=11[/tex]
Hence, the value of m=11
